## Version 5.0.4 (2015-09-08)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fixed an issue with Windows 10 guest kernel debugging over the network for Hyper-V paravirtualized VMs

- VMM: fixed a bug which prevented reading the saved state of the 'PATM' unit from VirtualBox 4.3.x (bug #14512)

- GUI: changed default OS type for Windows from Windows XP to Windows 7

- GUI: added another pre-defined guest screen resolution (bug #14384)

- GUI: fixed update check which was broken due to changing the location of the root certificates (bug #13096)

- GUI: fixed issues with synchronization of Caps lock / Num lock / Scroll lock on Windows hosts (bug #14302)

- GUI: don't crash during VM shutdown if 2D video acceleration and 3D support are enabled (Mac OS X hosts only)

- GUI: several seamless fixes for certain X11 window managers, also when used in multi-screen setups

- GUI: Log window size, position and cursor-position fixes

- Audio: fixed playing leftover/deprecated audio samples

- Audio: fixed playing audio after suspending the host (5.0 regression; Linux hosts using the ALSA backend)

- Audio: fixed playing short audio samples which were chopped off formerly

- Audio: fixed distortions on OS X when the sample rate of the guest stream and host device don't match

- Storage: fixed raw disk access and flat VMDK image access which would be always opened readonly (5.0.2 regression; bugs #14425, #14461)

- Storage: fixed initial encryption of VDI images after they were compacted (bug #14496)

- VGA: fix for certain graphics modes (bug #14516)

- NAT: don't freeze while the VM is paused if the network attachment mode is changed from/to NAT with activated port forwarding

- OVF: fixed duplicate USB controller entries in exported OVA/OVF (bug #14462)

- Shared Folders: fixed a path separator issue (bug #14434)

- Drag and drop: fixed crashes on OS X hosts when doing host-to-guest transfers

- VBoxManage: another attempt to not deny changing the network adapter type at VM runtime (5.0 regression; bug #14308)

- VBoxManage: fixed broken `guestcontrol <VM-Name> list` command (5.0 regression)

- VBoxManage: fixed broken Guest Control stdout/stderr output (5.0 regression)

- Mac OS X hosts: fixed remaining problems with activated SMAP (Broadwell and later; bug #14412)

- Mac OS X hosts: fixed broken 3D support (5.0.2 regression; bug #14476)

- Linux hosts: Linux 4.2 fix

- Linux hosts: don't crash on older Linux distributions if the DBus service isn't running (bug #14543)

- Windows hosts: fixed the VERR_LDR_MISMATCH_NATIVE error message (bug #14420)

- Windows hosts: fix for Windows 10 build 10525 and later (bug #14502)

- Windows hosts: fixed network adapter enumeration on Windows 10 (bug #14437)

- Windows hosts: prevent intermittent host network disconnects during VM start/shutdown with bridged networking (bug #14500)

- Windows Additions: fixed the call to the memory allocation function (bug #14415)

- Linux Additions: be more forgiving if the compilation of the vboxvideo module fails (bug #14547)

- X11 Additions: fixed a number of small issues with dynamic resizing and full-screen and seamless modes.

## Version 5.0.2 (2015-08-13)

This is a maintenance release. The following items were fixed and/or added:

- VMM: added support for guest crash report MSRs with Hyper-V paravirtualization

- VMM: fixed an issue causing artifically high load averages on Linux hosts

- VMM: fixed a kernel panic with thread-context hooks caused by incompatible changes made to Linux 4.2 kernels

- VMM: fixed a saved state issue with VT-x/AMD-V disabled (5.0 regression; bug #14304)

- VMM: fixed VERR_SUPDRV_TSC_DELTA_MEASUREMENT_FAILED Guru Meditations on certain AMD CPUs (5.0 regression; bug #14370)

- VMM: fixed a crash while creating a guest core dumps via the VM debug facility (5.0 regression)

- VMM: This release has AVX2 passthrough disabled on every host and AVX passthrough disabled for 64-bit VMs on 32-bit hosts. This will be properly fixed in a future 5.0.x maintenance release (see e.g. bug #14262).

- GUI: fixed rare hang and crash on VM shutdown/poweroff

- GUI: X11: fixed few crashes caused by the Qt alien widgets feature

- GUI: X11: fixed various mini-toolbar geometry quirks like positioning, z-order, transparency issues on certain window managers (bug #14257)

- GUI: X11: fixed mini-toolbar minimize button issue under certain window managers (bug #14284)

- GUI: VM menu actions availability should now be properly updated on full-screen/seamless/scaled mode switches

- GUI: disk encryption password validation should be performed when user confirmed the password, not after each entered symbol

- GUI: do not change the VM/group selection in the VM Manager to the newly created VM if it was created by another client (e.g. VBoxManage)

- GUI: Mac OS X: do not treat 'almost maximized' VM windows as 'maximized', watch for the strict window geometry instead

- GUI: improve the quality in scaled mode under some circumstances (5.0 regression; bug #14303)

- VBoxManage: do not deny changing the network adapter type at VM runtime (5.0 regression; bug #14308)

- VRDP: allow Windows 10 RDP clients (bug #14216)

- Audio: fix a possible crash on VM process termination (5.0 regression)

- Storage: improved raw disk access on OS X by unmounting any accessed volume before first use and prevent any mount attempt by the host (bug #14219)

- 3D: basic support for saving/restoring display lists

- Drag and drop: fixed guest to host transfers on OS X hosts

- Drag and drop: fixed memory leak on Windows guests

- Shared Folders: fixed a problem with accessing CIFS shares (bug #14252)

- Shared Folders: improved path conversion between hosts and guests with different path separators (bug #14153)

- API: skip resetting of immutable media when the VM in saved state is started (bug #13957)

- API: fixed method for setting medium IDs which used zero (invalid) UUIDs instead random (valid) UUIDs if no UUIDs were passed (bug #14350)

- API: for Windows host fix detection of API client crashes which have a session open

- OVF: properly export all VBox features including the setting for paravirtualization (bug #14390)

- Mac OS X hosts: El Capitan USB fixes

- Windows hosts: fixed crash when opening Windows dialogs from the VM process on Windows 10 (bug #14351)

- Windows hosts: fixed host-only adapter creation issues on Windows 10 (bug #14040)

- Windows hosts: fixed audio on Windows 10 (bug #14432)

- Linux hosts: more fixes for activated SMAP on Linux 3.19 and newer (Broadwell and later; bug #13961)

- Linux hosts: check then name space before attaching to a host network interface (bug #13795)

- Linux Additions: Linux 4.2 fixes (bug #14227)

- Linux Additions: improved the performance of stat() to speed up certain file operations on shared folders

- Windows Additions: fixed a potential crash in the WDDM driver with Windows 10 (bug #14190)

- Solaris Additions: added support for X.Org Server 1.17

- X11 Additions: various seamless mode fixes, including invisible windows under LXDE.

## Version 5.0.0 (2015-07-09)

This is a major update. The following major new features were added:

- Paravirtualization support for Windows and Linux guests to improve time-keeping accuracy and performance (see gimproviders)

- Make more instruction set extensions available to the guest when running with hardware-assisted virtualization and nested paging. Among others this includes: SSE 4.1, SSE4.2, AVX, AVX-2, AES-NI, POPCNT, RDRAND and RDSEED

- xHCI Controller to support USB 3 devices (see settings-usb)

- Drag and drop support (bidirectional) for Windows, Linux and Solaris guests

- Disk image encryption (see diskencryption)

- VMs can now be started in separate mode. The VM process is started headless while the frontend runs as a separate process which can be terminated without stopping the VM.

- GUI: VM guest-content scaling support (including 3D acceleration)

- GUI: New User Interface settings page for customizing status-bar, menu-bar and guest-content scaling

- GUI: New Encryption settings tab for customizing encryption options for disk images

- GUI: HiDPI support including application icons and optional unscaled HiDPI output on Mac OS X (including 3D acceleration)

- GUI: Hotplugging support for SATA disks

- New, modular audio architecture for providing a better abstraction of the host audio backends

- Support for the NDIS6 networking framework on Windows (default on Vista and later)

In addition, the following items were fixed and/or added:

- VMM: improved timing on Solaris hosts with older VT-x hosts without preemption timers

- VMM: further improvements for TSC frequency measurements and guest timekeeping

- VMM: debug facility now includes the guest CPU's FPU/SSE/extended state in the core dump

- VMM: fixed a hang under rare conditions on 32-bit hosts

- VMM: several fixes

- GUI: improved HID LEDs synchronization for Mac and Windows hosts. The physical LEDs state now restored together with the VM state.

- GUI: take the guest screen aspect ratio into account for the preview window

- GUI: provide direct access to storage media in the VM selector

- GUI: allow to save the VM state from the selector even if the VM is already paused

- VBoxManage: when exporting an appliance, support the suppression of MAC addresses, which means they will be always recreated on import, avoiding duplicate MAC addresses for VMs which are imported several times

- VBoxManage: now supports renaming storage controllers and USB controllers

- Guest Control: major overhaul, for example fixing wrong parameter quoting (bug #13157)

- USB: added USB traffic capturing (see usbtrafficcapturing)

- Made resizing X11 guests work more reliably

- API: block the removal of the current snapshot if it has child snapshots (only relevant for VMs without snapshottable hard disks, their presence always prevented removal), which resulted in VM config corruption

- API: mark VM configs with snapshots but without current snapshot as inaccessible, as this combination is nonsense

- API: fix information for some automatically generated events (only with XPCOM, Windows host was not affected), which caused errors when getting some of the attributes over the webservice (bug #12379)

- API: fix crashes in Java API clients using the XPCOM binding, happened with output parameters only (bug #11232)

- API: a number of settings (e.g. network settings) can now also be changed when the VM is in saved state

- API: fixed incorrect resuming of VMs on host-resume unless they were previously paused due to a host-suspend

- API: don't lose the saved state and "current state changed" flag during cloning of a VM

- API: OS type description consistency fix (bug #14162)

- VBoxSVC: don't keep the support driver permanently open

- Main/Properties: properly drop transient guest properties when the VM is powered off

- VRDP: fixed a couple of races which may cause a crash during VM poweroff

- ExtPack: don't fail if the TMP directory contains non-latin1 characters (bug #14159)

- 3D: fix potential race in which might cause a crash on VM termination

- 3D: fixed a possible memory leak in the host service

- Serial: new TCP/IP backend (see serialports)

- Storage: added USB mass storage device class (see harddiskcontrollers)

- Storage: added vbox-img standalone tool for direct manipulation of virtual hard disk images without VBoxManage

- Storage: fixed crash as a result of I/O errors in certain conditions (bug #13105)

- NAT: fixed several potential crashes

- NAT: don't forcibly reset/drop all connections when the link goes down

- Netsniffer: properly handle changing of the trace file name at VM runtime

- Audio: fixed audio output and input when changing the default audio device more than once on OS X

- Audio: fixed audio input on OS X under certain circumstances

- ICH9: fixed the interrupt disable logic for MSI interrupts; should fix old Linux guests with AHCI

- USB: improve playback with USB sound devices attached to the emulated OHCI controller

- Audio: provide Linux guests a different AC97 audio codec type so Linux ALSA does not mis-detect the link speed (default for new VMs)

- BIOS: fix for booting from SCSI CD/DVD media

- BIOS: fix for reads partially beyond end of disk (bug #14021)

- VRDP: fixed listening for IPv6 on some systems (bug #14038)

- rdesktop-vrdp: upgraded to version 1.8.3

- Linux hosts: fixed a bug which made the netfilter driver ignore certain events (bug #12264)

- Mac OS X hosts: El Capitan fixes

- Mac OS X hosts: fixed a bug which might trigger a host kernel panic if a VM is started and another hypervisor is active

- Solaris hosts: Solaris 12 installer fix

- Guest Additions: added a heartbeat service (see heartbeatservice)

- Linux hosts / guests: support for Linux distributions using systemd without sysv emulation (e.g. ArchLinux)

- Windows Additions/WDDM: improved video memory utilization and allow more/bigger guest screens with large resolutions (including HiDPI)

- Linux Additions: added -s parameter to mount.vboxsf to be sloppy with invalid parameters

- X11 Additions: fixed wrong DPI value (bug #14151)

- Mac OS X guests: limit the CPU family for legacy guests

- Solaris Additions: added quiesce support to co-operate with Solaris' fast-reboot feature

## Version 4.3.28 (2015-05-13)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fixed a Guru Meditation when rebooting certain guests (for example Solaris doing fast reboot) by fixing the implementation for INIT IPI

- VMM: added some information for diagnosing rare VERR_VMX_INVALID_VMXON_PTR Guru Meditations (VT-x only)

- GUI: HID LEDs sync: prevent synchronization if VM window has no focus (Windows and Mac OS X hosts only)

- GUI: fixed drag and drop moving the cursor between guest screens on certain hosts

- 3D: fixed a crash on restoring the VM state on X11 hosts (bug #12737)

- 3D: fixed a crash on restoring the VM state

- 3D: fixed a crash on Linux guest shutdown (bug #12772)

- VRDP: fixed incompatibility with rdesktop 1.8.3

- VRDP: fixed listening for IPv6 on some systems (bug #14038)

- Storage: don't crash if creating an asynchronous I/O context fails (e.g. when starting many VMs) and show a proper error message

- Floppy: several fixes

- Audio: improved the behavior of the volume control for the HD audio device emulation

- USB: increase the number of supported drivers from 3 to 5 (Windows hosts only)

- PS/2 keyboard: synchronize the LED state on VM restore (Windows and Mac OS X hosts only)

- NAT Network: when running multiple NAT networks with multiple VMs, only stop the respective services when stopping VMs (bug #14090)

- NAT: don't kill UDP bindings on ICMP errors (bug #13475)

- NAT: bandwidth limit now works properly with NAT (bug #11485)

- BIOS: fixed the returned size value of the VBE 2.0 PMI function 0Ah (4.2.0 regression; bug #14096)

- Guest Control: fixed parameter quoting in Windows guests (bug #13157)

- Webcam passthrough improvements for Linux (V4L2) hosts to support more webcam models

- API: don't fail starting a VM with VBOX_E_INVALID_OBJECT_STATE under certain conditions (bug #13617)

- API: be more verbose on VBOX_E_INVALID_OBJECT_STATE if a medium is attached to a running VM (bug #13560)

- API: fixed a bug which could result in losing certain screen resize events with multi-monitor guests

- rdesktop-vrdp: fixed path to the keymaps (bug #12066)

- rdesktop-vrdp: switch to version 1.8.3

- Windows hosts: more hardening fixes (e.g. bugs #14051, #14052)

- Linux hosts: another fix for activated SMAP on Linux 3.19 and newer (Broadwell and later; bug #13961)

- Linux hosts: Linux 4.1 compile fix (bug #14081)

- Solaris hosts: fixed using of VNIC templates with Crossbow based bridged networking to be compatible with vanity interface names

- Mac OS X hosts: fixed crash during VM termination under rare circumstances

- Windows Additions/WDDM: improved video memory utilization and allow more/bigger guest screens with large resolutions (including HiDPI)

- X11 Additions: prevent flickering when updating mouse cursor

- Solaris Additions: fixed incorrect usage of 'prtconf' while installing Guest Additions (Solaris 10 only)

## Version 4.3.26 (2015-03-16)

This is a maintenance release. The following items were fixed and/or added:

- GUI: in the snapshots pane, protect the age of snapshots against wrong host time (bug #13955)

- NAT Network: fixed a bug which prevented to propagate any DNS name server / domain / search string information to the NAT network (4.3.24 regression; bugs #13915, #13918)

- NAT Network: don't delay the shutdown of VBoxSVC on Windows hosts

- Mouse support: the mouse could not be moved under rare conditions if no Guest Additions are installed (4.3.24 regression; bug #13935)

- Storage: if the guest ejects a virtual CD/DVD medium, make the change permanent (bugs #9858, #12885)

- VGA: made saving secondary screen sizes possible in X11 guests

- SDK: fixed the VirtualBox.tlb file (4.3.20 regression; bug #13943)

- rdesktop-vrdp: make it work with USB devices again (4.3.14 regression; bug #13901)

- USB: fixed a possible BSOD on Windows hosts under rare conditions

- iPXE: enable the HTTP download protocol on non-Linux hosts (bug #13628)

- Mac OS X hosts: don't panic on hosts with activated SMAP (Broadwell and later; bug #13951)

- Linux hosts: don't crash Linux 4.0 hosts (bug #13835)

## Version 4.3.24 (2015-03-02)

This is a maintenance release. The following items were fixed and/or added:

- VMM: emulation fix for the ENTER instruction under certain conditions; fixes Solaris 10 guests (VT-x without unrestricted guest execution)

- VMM: fix for handling NMIs on Linux hosts with X2APIC enabled

- NAT/NAT Network: fix connection drops when the host's DHCP lease was renewed (4.3.22 regression; Windows hosts only; bug #13839)

- NAT: don't crash on an empty domain list when switching the DNS host configuration (4.3.22 regression; Mac OS X hosts only; bug #13874)

- PXE: re-enable it on Windows hosts (4.3.22 regression; Windows hosts only; bug #13842)

- Shared Folders: fixed a problem with Windows guests (4.3.22 regression; bug #13786)

- Audio: improved record quality when using the DirectSound audio backend

- VBoxManage: when executing the controlvm command take care that the corresponding VM runtime changes are saved permanently (bug #13892)

- Windows Installer: properly install the 32-bit version of VBoxRes.dll on 32-bit hosts (bug #13876)

- Linux hosts / guests: Linux 4.0 fixes (bug #13835)

- OS/2 Additions: fixed mouse integration (4.3.22 regression; bug #13825)

## Version 4.3.22 (2015-02-12)

This is a maintenance release. The following items were fixed and/or added:

- VMM: refined measurement of TSC frequency on the host, improves timekeeping for guests

- VMM: decreased CPU load resulting from guest MMIO writes to the virtual APIC

- VMM: fixed interception of debug exceptions, observed while using the dbx debugger on Solaris guests (VT-x only)

- GUI: 3D overlay window positioning code improved, fixed potential misplacement of 3D accelerated guest graphics content

- GUI: fixed accident SSL authentication failures during update check on Windows hosts (bug #12969)

- GUI: never send the "ACPI power" keyboard scancode to the guest, we have the ACPI power button for that

- GUI: was unable to properly restore seamless mode VM from snapshot/saved-state under some circumstances

- VBoxHeadless: don't crash if 3D is enabled in the VM settings (bug #10250)

- ATA: fixed several passthrough issues (bugs #12310, #1360)

- Audio: fixed DirectSound failure when the the host has no audio input device (Windows hosts only; bug #9205)

- SB16: fixed compatibility issue (bug #13769)

- Storage: fixed broken CD/DVD passthrough when using the IDE controller (bug #12310)

- NAT: new ping proxy for Windows hosts (bug #11871)

- NAT: Properly report outbound connect(2) failures to guest with TCP RST or ICMP (bug #10525)

- NAT Network: no need for frequent wakeups in VBoxNetDHCP and VBoxNetNAT (bug #11681)

- Host-only adapter: prevent Windows from creating an "Unidentified network" (bug #9688)

- Bridged Networking: don't leak host-to-guest traffic to the wireless network when bridging to a wireless interface (bug #13714)

- Main: fixed a possible race when changing the medium leading to a deadlock under rare conditions (bug #13722)

- VBoxManage: fixed return code if starting a VM failed (bug #13773)

- Settings: on Windows host, do not use environment variable HOME at all, the settings location is derived from the user profile directory (bug #7689)

- API: fixed 2 deadlock opportunities related to medium handling (bugs #13789, #13801, thank you Alexander Urakov)

- API: fixed bug in XPCOM which created too few worker threads, sporadically resulting in a deadlock (bug #13802, thank you Alexander Urakov)

- SDK: fixed a garbage collection leak in the Python VirtualBox webservice API binding (bug #13817)

- Linux hosts: fixes for activated SMAP (Broadwell and later, bug #13820)

- X11 guests: prevent unwanted hiding of guest screens on multi-monitor guests (bug #13287)

- X11 guests: added support for X.Org Server 1.17

- X11 Additions: fixed a memory leak in VBoxService if libdbus is available but dbus-daemon isn't running (bug #13770)

- Windows Additions: prevent VBox WDDM driver from loading if host reports weak OpenGL capabilities. 3D content now can be shown over Remote Desktop connection.

- Winodws Additions: some fixes for recent Windows 10 Previews

- Linux Additions: fixed a compatibility issue with 64-bit Linux 2.4 kernels

- Linux Additions: fixed a potential use-after-free when unloading the VBoxGuest module

- Linux Additions: Linux 3.19 fixes (bug #13741)

## Version 4.3.20 (2014-11-21)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fixed reboot hang of 32-bit Windows SMP guests (bugs #13319, #13462)

- VMM: proper Math Fault handling with certain legacy guests (bug #9042, AMD hosts)

- VMM: fixed a Guru Meditation VINF_EM_TRIPLE_FAULT on older CPUs that don't support MSR-bitmaps (VT-x only; bugs #13034, #13125, #13311, #13425, #13426, #13463, #13585)

- GUI: fix 3D overlay window reparenting issue when VM goes to fullscreen mode on X11 hosts

- GUI: fix occasional loss of focus in full-screen mode on X11 host systems (4.3.16 regression)

- GUI: Mac OS X: wizards should have Cancel button (bug #12541)

- GUI: added a global option to prevent automatic raising of the new window by mouse move with multi-screen guests (bug #8878)

- API: accept remote display port 0 as the default RDP port (bug #8534)

- VBoxManage: fixed crash when executing showvminfo command under certain circumstances (bug #13190)

- ACPI: fixed occassional Guru Meditations in ACPI timer code (4.3.18 regression; bug #13521)

- EFI: improved performance of IDE disk access

- EFI: fixed a bug in the EFI video driver which prevented Windows to boot in UEFI mode (bug #12022)

- EFI: properly announce the amount of RAM for big VMs (bugs #11103 and #13211)

- Storage: fixed a crash under certain cicrumstances when a medium was ejected from a drive attached to the SATA controller without inserting a new medium before pausing or closing the VM (4.3.16 regression)

- Storage: fixed an interrupt acknowledge issue causing hanging guests or slower I/O (4.3.18 regression)

- Storage: fixed broken resume after the VM was suspended due to a full disk if host I/O caching is used

- Storage: fixed a Guru Meditation under certain conditions when using the DevLsiLogic controller with VMs running in raw mode (4.3 regression; bugs #12254, #12655, #12709, #12774, #12886)

- Guest Control: fixed a bug which might lead to a crash during recursive copy

- SDK: Java COM bindings fixes

- iPXE: enable the HTTP download protocol (bug #13628)

- Runtime: do not use a fixed stack size creating temporary threads during initialization (bug #13038)

- Windows hosts: fixed more startup problems on certain Windows hosts due to conflicts with anti-virus software; better error reporting (4.3.14 regression; bug #13187)

- Windows hosts: fixed DirectSound host audio failure under certain conditions (bug #13418)

- Windows hosts: fixed additional cases of 4.3.14 regression whereby AltGr stopped working for some people (bug #13216)

- Windows Additions: preserve guest monitor layout when resizing Windows 7 or newer guests

- Linux Additions: Linux 3.18 compile fixes (bug #13515)

## Version 4.3.18 (2014-10-10)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fixed a potential misbehavior after restoring the A20 state from a saved state

- GUI: fixed full-screen mode mini-toolbar related regressions for different platforms and window managers (bug #13369)

- GUI: X11: fixed full-screen mode Unity panels quirk caused by mini-toolbar code changes in last release (bug #13365)

- GUI: X11: added possibility to use legacy full-screen mode as the new one can cause multi-screen issues under Unity, see legacy-fullscreen-mode (bug #13365)

- GUI: Mac OS X: fixed full-screen mode artifact causing black screen when 3D acceleration was enabled on 10.10 Yosemite hosts (bug #13448)

- GUI: Mac OS X: fixed regression in user-space swiping from/to VBox in full-screen mode

- GUI: Mac OS X: fixed issue with switching to VBox in full-screen mode through Alt+Tab and Mission Control

- Storage: fixed data corruption when resizing huge VHD images under certain circumstances (bug #11960)

- Storage: fixed a rare hang during startup when the BIOS enumerates the storage devices attached to the SATA controller

- Storage: follow the spec with AHCI interrupt acknowledge (bug #13474)

- Storage: fixed broken iSCSI authentication (4.3.14 regression; bugs #13386, #13435)

- NAT Network: properly parse port forwarding rules to allow UDP rules

- USB: fixed a crash on Linux hosts with older Linux kernels (bug #13400) and several other fixes

- ACPI: fixed ACPI timer anomalies (bug #12076)

- Guest Control: fixed a memory leak (bug #13434)

- Main: when removing a VM, do also remove the VBoxStartup.log file which might exist on Windows hosts (bug #13478)

- Windows hosts: fixed more startup problems on certain Windows hosts due to conflicts with anti-virus software; better error reporting (4.3.14 regression; bug #13187)

- Windows hosts: propagate the process startup information to the child process (4.3.14 regression; bug #13243)

- Mac OS X hosts: don't force using the discrete GPU (bug #11111)

- Windows Additions: some Windows 10 tweaks

- X11 guests: fix a bug handling video driver display properties which prevented GNOME Shell on Fedora 21 from starting

- Linux hosts / guests: fixed a few remaining warnings in the kernel log if memory allocation fails (bug #11171)

## Version 4.3.16 (2014-09-09)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fixed restoring 32-bit FPU state on 64-bit capable VMs and restoring guest FPU in raw-mode VMs (bug #12646; 4.3 regression)

- GUI: properly restore normal/scale mode guest-screen size after exiting full-screen/seamless mode

- GUI: mini-toolbar should provoke less artifacts/conflicts with 3D guest rendering

- GUI: Mac OS X: Native full-screen multi-screen transition was able to blackout host-screens for nearly minute

- GUI: X11: Modern window managers should now use native full-screen multi-screen mapping API

- GUI: added extradata item for configuring the mouse capture behavior, see mouse-capture (bug #3506)

- Storage: fixed a VBoxSVC crash when querying an iSCSI target with authentication configured (4.3.14 regression)

- Storage: fixed a rare data corruption during reads if another allocating write is running concurrently and accesses the same range

- Storage: fixed a rare crash for certain VHD images from other products

- Storage: fixed a rare release assertion when using the AHCI controller

- Floppy: fixed read errors and guest memory corruption when running under control of QEMM

- 3D: added experimental support for rendering on offline GPUs for Mac OS X host

- 3D: fixed white window appearing on entering FullScreen mode on Mac OS X host

- 3D: fixed video recording support for 3D data regression (bug #13073)

- 3D: fixes for MS Office 2013 support

- 3D: several fixes

- Bridged Networking: improved IPv6 support when bridging to a wireless interface

- NAT: prevent internal DNS service from stuck in host-resolver mode when host was switched from one network to another one while host was sleeping (Mac OS X hosts)

- NAT: preserve DF (if possible) and TOS when proxying outbound UDP datagrams (bugs #9440, #12309)

- NAT: don't let multicast datagrams out (bug #7338)

- NAT: fixed handling of large incoming UDP datagrams on Windows hosts (bug #12136)

- NAT: fixed handling of the RFC 1533 DHCP PAD option

- NAT Network: fixed inbound half-close on Windows hosts

- NAT Network: preserve IPv4 DF (if possible), TTL, TOS and IPv6 Hop Limit when proxying outbound UDP datagrams

- VRDP: fixed a rare crash when using remote audio input

- USB: fixed several regressions from 4.3.14 (bug #13320)

- Audio: made the HDA sound emulation work with certain Mac OS X guests (e.g. Mountain Lion)

- Windows hosts: fixed startup problems on certain Windows hosts due to conflicts with anti-virus software (4.3.14 regression; bug #13187)

- Windows hosts: fixed 4.3.14 regression whereby AltGr stopped working for some people (bug #13216)

- X11 hosts: made the extra key on Brazilian Thinkpads work (bug #8745)

- X11 hosts: fixed a problem of input focus cycles and immediately released key presses in full screen mode (bug #13238)

- Linux hosts: fixed flooding the kernel log with USB related messages when passing through certain USB devices to a VM (bug #13085)

- Linux guests: stop applications crashing when drm_wait_vblank is called (bug #13265)

- Linux guests: fix a crash in gnome-session (bug #13335)

- X11 guests: do not start VBoxClient over an SSH connection (bug #13107)

- X11 guests: added support for X.Org Server 1.16 (bug #13207)

- X11 guests: fixed a wrong parameter in the video driver which caused problems with full-screen X11 clients (bug #2748)

- VirtualKD: introduced stub/loader device for speeding up Windows kernel debugging, details see http://virtualkd.sysprogs.org/

## Version 4.3.14 (2014-07-15)

This is a maintenance release. The following items were fixed and/or added:

- VMM: more fixes for MSR emulation on certain hardware (bugs #12784, #12949, #13034)

- VMM: improve MSI handling under rare circumstances (only relevant for the ICH9 chipset)

- VMM: fixed #UD exception for 64-bit guests with the EFER.SCE bit and the SYSCALL instruction (VT-x only; 4.3 regression; bug #13008)

- VMM: fixed timekeeping after resuming SMP guests

- VMM: properly wake up a halted VCPU on NMI/SMI

- GUI: fixed a potential crash

- GUI: fixed stuck AltGr key on Windows hosts (bug #2537)

- GUI: fixed a potential error during the version check

- GUI: shortcut change should not require Enter/Return (or other trigger) to confirm (bugs #12828, #12847, #12937, #13087)

- GUI: fixed update check which was broken due to changing the location of the root certificates (bug #13096)

- VBoxManage: fixed typo in showvminfo --machinereadable (bug #13176)

- NAT: fixed inbound half-close (bug #13116)

- NAT: fixed slow upload speed under certain conditions (bug #10034)

- NAT Network: fixed potential loss of inbound TCP data

- NAT Network: fixed potential infinite stalls of TCP connections over IPv6

- NAT Network: fixed resets of TCP connections on Windows hosts

- NAT Network: fixed inbound half-close on Mac OS X hosts

- NAT Network: fixed socket leak on Solaris hosts

- NAT Network: fixed ping of mapped host loopback on Mac OS X and Solaris hosts, fixed proxying of IMCP errors on Mac OS X

- Host-Only Network: fixed SNMP ifConnectorPresent value on Windows (bug #13143)

- Storage: fixed a possible crash with CD/DVD passthrough under certain circumstances

- Storage: fixed a crash when trying to open an inaccessible QED or QCOW image (bug #12613)

- Storage: fixed data corruption or read errors under rare circumstances

- AHCI: fixed a crash under rare circumstances

- USB: performance fixes

- ICH9: properly reset MSI capability on reset

- Keyboard: active modifier keys during suspend were stuck after resuming the host

- 3D: fixed misbehavior with huge guests (i.e. guest more than 4GB guest memory

- 3D: several fixes

- API: properly detect the Windows 8.1 guest OS type (bug #13090)

- ExtPack: cleanup of dangling uninstallation directories

- Linux hosts / guests: compile fix for EL7 (bug #12638)

- Linux Additions: made 3D pass-through work with recent versions of Mesa in the guest (bug #12941)

- Linux Additions: Linux 3.16 fixes (bug #13123)

- Mac OS X hosts: when scanning for host CD/DVD devices also consider BlueRay devices

- Mac OS X hosts: fixed host shutdown and reboot delay caused by running VBoxSVC process in some cases

- OS/2 Additions: fixed gengradd.dll library name (bug #12785)

- Solaris Additions: fixed permissions of files and directories located on shared folders

- Windows host installer: fixed the need for rebooting Windows after installation or upgrade, extended logging for NetFlt/NetAdp (un)installation

## Version 4.3.12 (2014-05-16)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fixed an occasional Guru Meditation (Mac OS X hosts only; bugs #12727, #12954)

- VMM: fixed a rare condition that would fail to invalidate guest TLB entries or would invalidate them when not required (Windows hosts only)

- VMM: fixed a VERR_NOT_SUPPORTED Guru Meditation seen with certain guests, e.g. OpenServer 5.0.7

- VMM: more fixes for MSR emulation on certain hardware (bugs #12240, #12875)

- GUI: fixed mouse positioning with mouse integration disabled and multiple guest screens (Windows hosts only; bug #9059)

- GUI: fixed crash in VM manager (bug #12878)

- GUI: fixed crash under rare conditions on entering/exiting full-screen/seamless mode

- Shared Clipboard: don't stop working after taking a snapshot (bug #12700)

- AHCI: fixed a crash under rare circumstances

- API: fixed a hang during VM shutdown under rare conditions

- NAT: fixed generation of malformed ICMP error datagrams (4.3.10 regression)

- NAT: fixed potential crash in DNS proxy

- NAT Network: don't drop port forwarding rules after some time

- NAT: fixed ARP cache corruption and network loss in Windows guest caused by iSCSI service activity

- USB: improved check if a storage device is currently mounted to the host when the device is about to be attached to the VM (Mac OS X hosts only; #11038)

- 3D support: several fixes, including better support for Ubuntu 14.04

- VRDP: fixed a potential crash on client disconnect (bug #12858)

- VBoxSVC: fixed a race when a new client is started a few seconds after the last client terminated (Windows hosts only; bugs #11309, #12509)

- VBoxSVC: fixed VirtualBox.xml registry corruption after VM renaming

- VBoxSVC: fixed a potential crash caused by incorrect USB device filter (Mac OS X hosts only; #11038)

- Windows hosts: partly support 32-bit COM on 64-bit systems

- Windows host installer: implemented merge module (msm) support

- Linux hosts: fixed dependency of boot script on older Debian systems (bug #12262)

- Linux guests: fix symbolic link to shared folder helper (bug #12879)

- Linux Additions: don't crash VBoxService during guest execute for users without a password (bug #12994)

- Linux Additions: fixed a bug in guest execution where the guest process terminated with VERR_INTERRUPTED to the host

## Version 4.3.10 (2014-03-26)

This is a maintenance release. The following items were fixed and/or added:

- VMM: more work on improving the emulation of certain MSR registers on certain host CPUs (e.g. bugs #12734, #12736, #12744, #12748, #12686, #12770)

- VMM: fixed single-stepping for real-mode guests (VT-x without unrestricted guest execution) and some I/O instructions (bug #12636)

- VMM: fixed a potential problem with COW pages if nested paging is not available

- GUI: Mac OS X: experimental native full screen support for Mountain Lion and Mavericks (bug #12292)

- GUI: Mac OS X: removed the mini-toolbar minimize button which doesn't work under Mac OS X full screen mode anyway

- GUI: experimental HID LEDs synchronization for Windows and Mac OS X hosts: fixed keyboard re-synchronization if the feature is disabled (as done by default; bug #12758)

- GUI: fixed a potential crash when opening the preferences menu (bug #12862)

- OVF: fixed a crash of the VirtualBox Manager when re-starting guest export (bug #12586)

- 3D support: several fixes

- HGCM: fixed a problem with saved states which could cause several guest misbehavior after a VM was started from a saved state

- Storage: fixed a bug preventing to compact differential snapshots under certain conditions

- VBoxSVC: fixed a segmentation fault on Linux hosts if a very long path exists under /dev (bug #12760)

- API: fixed guest misbehavior under certain conditions if a storage medium was attached or removed at VM runtime

- Windows installer: make the --silent parameter work again (bug #12764)

- Mac OS X Networking: prevent local traffic (VM-to/from-host) from leaking to wire (bug #12750)

- Windows Additions: fixed the environment for guest processes (4.3.8 regression; bug #12782)

- Windows Additions/WDDM: fixed divide by zero exception with multiple guest screens under certain conditions

- Windows Additions/WDDM: fixed crashes with 2D video acceleration enabled (4.3.8 regression; bug #12745)

- Linux Additions: install correctly on Ubuntu guest systems with a /usr/lib64 directory (bug #12513)

- X11 Additions: fix for the VBoxClient process not exiting correctly (bug #12348) and consuming too much processor time

## Version 4.3.8 (2014-02-25)

This is a maintenance release. The following items were fixed and/or added:

- VMM: more work on improving the emulation of certain MSR registers (e.g. bugs #12224, #12544)

- VMM: fixed a VERR_INVALID_RPL Guru Meditation when booting certain guests (bug #11350)

- VMM: experimental support for SSE 4.1 / SSE 4.2 passthrough, see the user manual how to enable it (bug #8651)

- VMM: fix for recent Linux kernels with software virtualization

- GUI: experimental HID LEDs synchronization for Windows hosts, see hidledssync

- GUI: warn the user if the Oracle Extension Pack is not installed and the user tries to activate the remote display feature (bug #9104)

- GUI: make sure that a minimized guest (using mini toolbar in full screen / seamless mode) keeps the minimized state (bug #12199)

- GUI: popup banner's "do not show this message again" check-box replaced with corresponding button

- GUI: network adapter cables can now be connected/disconnected directly through the running virtual machine Devices / Network menu a Network status-bar indicator

- GUI: the new VM wizard now proposes 64-bit guests on 64-bit hosts by default; better distinction between 32-bit OS types 64-bit OS types (bug #12533)

- GUI: better error message if appliance import fails (bug #12657)

- GUI: allow to set host-combination to 'None' using the Global settings / Input page (bug #12730)

- GUI: don't switch the guest to a black screen during online snapshot merge (4.3 regression)

- VBoxManage: when exporting an appliance, support the suppression of MAC addresses, which means they will be always recreated on import, avoiding duplicate MAC addresses for VMs which are imported several times

- AHCI: fixed a VM hang during suspend under certain circumstances

- AHCI: fixed a VM hang during online snapshot merge under certain circumstances

- AHCI: fixed a bug which resulted in Windows XP guest hangs if a SATA CDROM is attached (bug #12417)

- AHCI: fixed a Guru Meditation under certain conditions

- AHCI: ejecting a CD/DVD medium failed under certain conditions

- AHCI: disk hotplugging fixes

- NAT: transparent handling of host sleep/resume and network configuration changes if the dnsproxy is enabled or if the hostresolver is used (bug #12441)

- NAT: fixed crash and misbehaviour under some circumstances with ICMP packets having TTL=1

- NAT Network: fixed IPv6 reassembly

- NAT Network: ping proxy implemented

- OVF: fixed reading of the OVF 0.9 section element (4.3 regression; bug #12345)

- OVF: several fixes

- 3D support: several fixes, multiscreen fixes (e.g. bug #9124)

- 3D support: include 3D content in captured videos (bug #12666)

- 3D support: include 3D content in captured screenshot (bug #11758)

- VGA: proper handling of legacy graphics modes if the Guest Additions are active (bug #6649)

- USB: fixed crash during isochronous transfer under rare circumstances

- BIOS: better disk geometry handling of SCSI drives

- API: fix crashes in Java API clients using the XPCOM binding, happened with output parameters only (bug #11232)

- VBoxSVC: documented the handling of host power management events (see hostpowertweaks) and added an extradata item for configuring the handling of the battery-low event (bug #9925)

- VBoxSVC: fixed a bug which could trigger a crash if a VM snapshot was restored the second time and the VM has associated bandwidth groups (bug #12569)

- VBoxSVC: properly detect ifconfig if located in /bin (bug #12713)

- Shared Folders: fixed a failure to restore transient shared folders when starting a VM from a saved state (bug #12578)

- Mac OS X hosts: fixed issue when the application icon was frozen in the dock if the bridging interface was not connected to a network (bug #12241)

- Linux hosts: also consider the physical package ID when determining the number of physical CPU cores

- Linux hosts / guests: don't warn in kernel log if memory allocation fails (bug #11171)

- Solaris hosts: fixed the autostart SMF script (bug #11720)

- Windows hosts: fixes for non-ANSI code page user names and similar environment contents (bug #12596)

- Windows hosts / guests: fixed setting and using a guest user's process environment variables (relevant for Guest Control)

- Windows Additions: fixed handle leaks in VBoxTray (bug #12563)

- Windows Additions: fixed a crash while detecting active guest users

- Windows Additions: fixed restoring backed up D3D files on XPDM -> WDDM upgrade

- Guest Control: fixed setting and using a guest user's process environment variables

- Linux Additions: support Enterprise Linux 6.5 kernels (bug #12505)

- Linux Additions: fixed CPU hot-remove on newer Linux kernels

- Linux / Solaris Additions: don't automount a shared folder which is already mounted

- X11 Additions: support X.Org Server 1.15 (bug #12623)

## Version 4.3.6 (2013-12-18)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fixed a Guru Meditation VINF_EM_TRIPLE_FAULT caused by VMCB caching with nested paging on certain AMD CPUs (bug #12451)

- VMM: fixed a Guru Meditation VERR_VMX_UNEXPECTED_INTERRUPTION_EXIT_TYPE while intercepting debug exceptions (VT-x only; bug #12410)

- VMM: fixed a Guru Meditation VERR_SVM_UNEXPECTED_EXIT while intercepting debug register accesses (AMD-V only; bug #12481)

- VMM: fixed a VERR_SSM_STRUCTURE_MAGIC error when trying to load a saved state made with VBox 4.3.4 when VT-x/AMD-V is disabled. Unfortunately, VBox 4.3.4 produced broken saved states for this configuration so you have to discard these states (bug #12414)

- VMM: added a few more MSRs to the whitelist required by certain guests (bug #12245)

- GUI: fixed deleting of inaccessible VMs (4.3 regression; bug #12205)

- GUI: fixed warnings in VM settings / number of guest processors (bug #12480)

- Main: don't automatically enable 64-bit guests on 64-bit hosts if VT-x/AMD-V is not available (bug #12424)

- Main: always expose the DMI memory information to Windows 2012 guests (bug #12017)

- Main: fixed occasional crashes on guest display resolution change (bug #7063)

- Main: fixed reporting back temporary name when calling IGuestSession::DirectoryCreateTemp() (bug #12498)

- API: fix for a hang when launching a GUI VM through the API, which crashes due to GUI unavailability

- Storage: fix for BLKCACHE_IOERR runtime errors under rare circumstances (bug #11030)

- Network: allow to start more than 5 PCNet instances (bug #12426)

- E1000: if the cable was disconnected before the guest initialized the device, the link status was not properly set to 'down' after the initialization completed despite the fact that there was no connection

- 3D support: fixed offset of guest 3D image elements (Mac OS X Retina hosts only; bug #11021)

- Solaris hosts: fixed accessing the host driver from non-global zones (4.3 regression; bug #12271)

## Version 4.3.4 (2013-11-29)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fix for a bug in the Local APIC emulation causing a BSOD when booting certain guests (4.3.0 regression; bug #12240)

- VMM: fixed loading of saved states if VT-x/AMD-V was disabled (4.3.2 regression; bug #12291)

- VMM: fixed single-stepping inside the guest for certain instructions (VT-x only; bug #10947)

- VMM: fixed a performance issue involving APIC accesses after rebooting a VM (4.3.0 regression; VT-x only; bug #12296)

- VMM: fixed TPR patching to be enabled for 32-bit guests even when the chosen guest type is 64-bit (4.3.0 regression; AMD-V only)

- VMM: fixed occasional VINF_EM_TRIPLE_FAULT errors on hosts without the unrestricted guest execution feature (bug #12198)

- GUI: don't bother the user with the BPP warning if no Guest Additions are installed

- GUI: fixed machine-window paint artifacts on VM reboot / guest-screen resize

- GUI: make sure the assigned license and description are attached to the exported appliance

- GUI: fixed bugs in close VM action restrictions handling (bug #12333)

- GUI: fixed incorrect wizards text colors for some unusual look and feel styles (bug #11743)

- GUI: should restore seamless mode as soon as possible after VM reboot or shutdown

- GUI: fixes for medium enumeration

- GUI: the OS X hot corners were not accessible while a VirtualBox VM is running (Mac OS X hosts only; bug #4139)

- GUI: fixed an old bug which bared the host from cleanly shutdown / reboot if the VM selector window is open (Mac OS X hosts only; bug #8254)

- Host-only Networking: fixed creating of host-only network interfaces (4.3.0 regression; bug #12182)

- NAT: don't run into an infinite loop in case the host cannot access any DNS server (4.3.0 regression; bug #12300)

- NAT: don't re-connect the cable if the DNS information changes and the cable was disconnected before (4.3.0 regression; bug #12225)

- NAT: fixed several issues with automatically starting / terminating of NAT networks on VM start / stop and configuration changes

- VBoxNetDHCP: don't block prevent VBoxSVC from terminating (bug #12264)

- 2D Video acceleration: fix crashes on presentation mode switches (bug #9194)

- BusLogic: allow to run VMs with more than one BusLogic SCSI controller enabled

- Keyboard: fixed a VM crash if a VM was resumed from a saved state where at least one key was pressed (bug #11289)

- VBoxSVC: fixed a heap corruption under certain conditions (4.3.0 regression)

- VBoxSVC: fixed a race leading to a hang during initialization (bug #12349)

- OVF: fixed import logic for OVF appliances containing multiple VMs

- OVF: improved logic for finding an appropriate image format during OVF import

- API: block the removal of the current snapshot if it has child snapshots (only relevant for VMs without snapshottable hard disks, their presence always prevented removal), which resulted in VM config corruption

- API: mark VM configs with snapshots but without current snapshot as inaccessible, as this combination is nonsense

- API: fixed information for some automatically generated events (only with XPCOM, Windows host was not affected), which caused errors when getting some of the attributes over the webservice (bug #12379)

- SDK: extended the functionality coverage for the C bindings

- Guest Control: various bugfixes and improved VBoxManage help (bugs #8072, #11044, #12336, #12338, #12346, #12371)

- Windows hosts: another attempt to fix the massive DPC latency (bug #6242)

- Windows host installer: make registering file extensions optional, contributed by Tal Aloni (bug #8009)

- Mac OS X hosts: properly sign the kernel extensions for Mavericks hosts (bug #12256)

- Mac OS X hosts: fixed a bug where the VirtualBox dock icon was not properly removed from the dock after a VM terminated preventing Mavericks hosts from shutting down (bug #12241)

- Mac OS X hosts: fixed minor installer issue (bug #12275)

- Linux hosts / guests: Linux 3.13 compile fixes (bug #12358)

- Linux guests: build the vboxvideo kernel module correctly on OL/RHEL 6.1 guests (bug #11996)

- Linux guests: make 3D work on Slackware 14.1 (bug #12320 comments 3 and 4)

- Guest Additions/3D: fixed an occasional dead-lock (bug #12319)

- Windows Additions/3D: fixed possible memory leaking (bug #12228)

- Windows Additions/XPDM: use separate tables containing valid video modes for each virtual monitor

- Windows Additions: fixed automatic logins for Vista and newer Windows guests (bug #12332)

## Version 4.3.2 (2013-11-01)

This is a maintenance release. The following items were fixed and/or added:

- VMM: fixed restoring of the auxiliary TSC MSR in VT-x that caused host BSODs on Windows 8.1 hosts and unpredictable behavior on other hosts (bug #12237)

- VMM: provide fake values for a couple of MSRs to make more guests happy on certain hosts

- VMM: fixed detection of VT-x on certain machines where the BIOS would not set the VMX LOCK feature bit, which affected the VM settings in the GUI

- VMM: fixed TPR threshold which caused BSODs on Windows XP guests that use the I/O APIC (VT-x only; bug #12227)

- VMM: fixed PATM saved state incompatibility for software virtualized VMs (bug #12222)

- VMM: don't fail if AMD-V isn't available if the VM is configured to use software virtualization

- GUI: fixed guest resize breakage on visual representation mode change (when switching from normal to full screen etc)

- GUI: make sure the guest screen is resized after restoring a VM from a saved state if the host screen size changed

- GUI: disabled SCROLL LED sync from HID LEDs synchronization (Mac OS X hosts only)

- Webcam passthrough improvements including GUI support (see webcam-passthrough)

- Guest Control: implemented more `IGuestSession` methods

- Guest Control: added support for deleting and renaming guest files + directories in VBoxManage

- Guest Control: various bugfixes

- API: incorrect handling of hardware UUID default value, resulting in an all zero DMI/SMBIOS UUID, which leads to Windows requesting re-activation (4.3 regression; bug #12244)

- 3D support: fixed crash on shutdown if 2D video acceleration is enabled (Mac OS X hosts only)

- 3D support: miscellaneous fixes

- Storage: fixed detection of CD/DVD media when switching from an empty to a host drive with passthrough enabled

- Storage: fixed hang of the VM process when the disk is full under certain circumstances

- NAT: listen for changes of NAT Network setting at runtime

- NAT: NAT Network DHCP server now saves leases to a persistent storage

- Main: monitor changes in host DNS configuration

- Mac OS X host: reworked a mechanism of adding a VM desktop alias from the VM selector

- Mac OS X installer: remove old kernel extensions during upgrade (bug #12258)

- Linux Additions: correctly set umask before installing (bug #12166)

- X11 Additions/3D: fix freezes starting 3D desktop (bug #11503, thank you Sam Spilsbury)

- X11 Additions/3D: fix depth buffer support (bug #11905)

- X11 Additions/3D: fix Age Of Empires 3 rendering (bug #11331)

- Windows Additions/3D: fix Google Earth plugin rendering

- Windows Additions/WDDM: autoresize fixes

## Version 4.3.0 (2013-10-15)

This is a major update. The following major new features were added:

- VMM: major rewrite of the VT-x code and the AMD-V code including many bug fixes and performance improvements (for example bug #9659)

- VMM: introduced a lightweight instruction interpreter for situations not handled by hardware virtualization

- GUI: extended messaging mechanism (new non-modal popup overlays used to show non-critical warnings and provide user with additional information)

- GUI: keyboard shortcuts management (input page of global preferences extended with possibility to edit general keyboard shortcuts for VirtualBox Manager and Virtual Machine)

- GUI: video capturing support (bug #4766)

- Added USB touch device emulation

- Added experimental support for webcam passthrough complementing USB passthrough (see webcam-passthrough)

- Added SCSI CD-ROM emulation, including boot support

- VRDP: support for IPv6

- Guest Control: guest sessions now are running in dedicated, impersonated session processes (needs at least Guest Additions 4.3 installed)

- Guest Control: implemented `IGuestFile` support

- NAT: experimental virtual router mode: several VMs are attached to the same internal network and share one NAT service (see network_nat_service)

In addition, the following items were fixed and/or added:

- VMM: significantly improved performance of NetWare 5.x/6.x guests on host systems without nested paging support

- VMM: fixed losing host NMIs while in VT-x guest-context

- VMM: changed order of actions in emulated task switch (bug #10532)

- VMM: allow to activate VT-x while in SMX mode and provide more information if that is not possible

- GUI: update check uses https

- GUI: numerous minor internal cleanups and bug fixes

- GUI: HID LEDs synchronization when switching between guest window(s) and host (Mac OS X hosts only)

- GUI, VBoxManage: when unregistering a VM, also unregister the hard disk images which are used exclusively (bug #10311)

- GUI: use the number of physical presented processor cores instead of the number of logical processor cores to check if the users assigned too many virtual CPUs to the guest

- Snapshots: made live snapshots work again (bug #9255)

- Teleportation: made it work again (bug #9455)

- Storage: implemented AHA-154x compatibility mode in the emulated BusLogic SCSI HBA

- Storage: significantly improved performance of large ATAPI PIO transfers (BeOS, Minix 3 guests affected)

- Storage: added floppy formatting emulation (NB: cannot be used to change existing media geometry)

- Settings: global and per-VM default frontend configuration, useful to select the use of alternative VM frontends

- Settings: limit depth of snapshot tree to 250 levels, as more will lead to decreased performance and may trigger crashes

- Settings: the per-VM hwvirtextexcl setting has been replaced by a global hwvirtexclusive property

- Main: new event queue implementation which does not use the host's native event queue for processing VirtualBox events anymore

- Main: eliminate the use of SysV semaphores on all host OSes other than Windows, namely Linux, Solaris and Mac OS X, with the consequence that no system reconfiguration is needed to run more than approximately 100 VMs

- Main: use the XDG standard configuration folder instead of .VirtualBox on systems where it is appropriate (bug #5099)

- Main: extension pack framework can now support loading HGCM modules, contributed by Jeff Westphal

- VBoxManage: list more information about hard disk/DVD/floppy media, and support the `--long` option to show really all available details

- VBoxManage: added support for optional command line parameters for the automatic Guest Additions update

- VBoxManage: added support for listing active guest sessions, guest processes and/or guest files via `guestcontrol list <all|sessions|processes|files>`

- VBoxManage: added support for closing active guest sessions via `guestcontrol session close --session-id <ID>| --session-name <name or pattern>|--all`

- VBoxManage: added support for terminating active guest processes via `guestcontrol process kill|close|terminate --session-id <ID>| --session-name <name or pattern> <PID> ... <PID n>` or `guestcontrol [p[s]]kill --session-id <ID>| --session-name <name or pattern> <PID> ... <PID n>`

- VBoxManage: added support for watching guest sessions via `guestcontrol watch`

- VBoxManage: added `modifyvm --triplefaultreset` to make the VM reset on triple fault instead of triggering a Guru Meditation (see vboxmanage-modifyvm)

- 3D support: several fixes

- 3D support: several fixes for Mac OS X hosts

- OVF: several fixes

- Extpack Installer: make it work if the file is located in a folder with special characters

- Keyboard: fix for reporting key sequences like Ctrl+Alt+Del for the USB keyboard emulation

- Shared Clipboard/X11: support for BMP-format images, contributed by François Revol

- Mac OS X hosts: limited support for Mac OS X 10.9 (Mavericks)

- Mac OS X hosts: use a launchd script instead of the deprecated StartupItem mechanism (bug #8940)

- Windows hosts: don't cause massive DPC latency (only on certain hosts; still needs improving; bug #6242)

- Windows hosts: consider symlinks when retrieving volume information (bug #11962)

- Windows hosts: fixed an issue with USB2 devices being inaccessible when plugged into USB 3.0 ports

- Windows Additions: fixed misbehavior with guest display power management (WDDM driver only; bug #11170)

- Windows Additions: fixed memory leak caused by WTSQuerySessionInformation() on Windows 2000 guests (bug #12072)

- Windows Additions: ability to track guest user idle times through the newly introduced event IGuestUserStateChangedEvent

- Linux Additions: fixed udev detection in the init script with Linux 3.x kernels