Windows hosts: fixed host crashes/hangs on certain 32 bits Windows systems when running Linux guests (bugs #1606, #2269, #2763)
Windows hosts: Fixed network component BSOD issue (bugs #3168, #2916)
Windows hosts: Fixed installation issues (bugs #2517, #1730, #3130)

Linux hosts: fixed occasional kernel oopses (bug #2556)
Linux hosts: fixed module dependency for shipped modules (bug #3115)
Linux hosts: moved the udev rules for USB forward so that they don’t override existing system rules (bug #3143)
Linux hosts: fixed the issue with guest not being able to communicate with each other when attached via TAP interfaces (bug #3215)
Linux hosts: give up probing for USB gracefully if dbus or hal are not available (bug #3136)
Linux hosts: fixed warnings in installer when SELinux was disabled (bug #3098)
Linux hosts: VirtualBox sometimes failed to start if it had been started using sudo previously (bug #3270)

Solaris hosts: fixed high CPU load while running many guests in parallel
Solaris hosts: fixed inability to start more than 128 VMs

VMM: fixed performance regression for Windows guests (bug #3172)
VMM: ignore CPU stepping when restoring a saved state/snapshot

REM: fixed inability to use gdb to debug programs in Linux guests with software virtualization (bug #3245)

GUI: fixed dead key handling on Solaris hosts (bug #3256)
GUI: in the shutdown dialog, disable the action send the shutdown signal if the guest is currently not using ACPI
GUI: suppress additional key release events sent by X11 hosts when keys are auto-repeated (bug #1296)

API: restore case insensitive OS type name lookup (bug #3087)

VBoxHeadless: really don’t start X11 services (clipboard service, 3D acceleration; Solaris & Darwin hosts only; bug #3199)

NAT: fixed occasional crashes when the guest is doing traceroute (non-Windows hosts; bug #3200)
NAT: fixed crashes under high load (bug #3110)
NAT: fixed truncated downloads (Windows hosts only, bug #3257)
NAT: don’t intercept TFTP packages with a destination address different from the builtin TFTP server (bug #3112)

USB: several fixes for USB passthrough on Linux hosts
USB: reduced host CPU utilization if EHCI is active

VRDP: fixed VRDP server black screen after a client reconnect (bug #1989)
VRDP: modified rdesktop client (rdesktop-vrdp) now uses NumLock state synchronization (bug #3253)

LsiLogic: make FreeBSD guests work (bug #3174)

ATA: fixed deadlock when pausing VM due to problems with the virtual disk (e.g. disk full, iSCSI target unavailable)

iSCSI: fixed possible crash when pausing the VM

3D support: added missing GL_MAX_TEXTURE_COORDS_ARB (bug #3246)

Windows Additions: fixed ERROR (e0000101) error during installation (bug #1923)
Windows Additions: fixed Windows Explorer hang when browsing shared folders with 64 bit guests (bug #2225)
Windows Additions: fixed guest screen distortions during a video mode change
Windows Additions: fixed the Network drive not connected message for mapped shared folders drives after the guest startup (bug #3157)

Linux Additions: fixed occasional file corruption when writing files in O_APPEND mode to a shared folder (bug #2844)
Linux Additions: the mouse driver was not properly set up on X.Org release candidates (bug #3212)
Linux Additions: fixed installer to work with openSUSE 11.1 (bug #3213)
Linux Additions: disable dynamic resizing if the X server is configured for fixed resolutions
Linux/Solaris Additions: handle virtual resolutions properly which are larger than the actual guest resolution (bug #3096)