VirtualBox 4.3.16 is a maintenance release. The following items were fixed and/or added since VirtualBox 4.3.14: 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 the manual for more information (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 OSX 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 OSX 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 [url=http://virtualkd.sysprogs.org/here[/url]