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
- 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
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