Guest Control: implemented more IGuestSession methods Webcam passthrough improvements including GUI support (see the manual for more information) GUI: disabled SCROLL LED sync from HID LEDs synchronization (Mac OS X hosts only) GUI: make sure the guest screen is resized after restoring a VM from a saved state if the host screen size changed GUI: fixed guest resize breakage on visual representation mode change (when switching from normal to fullscreen etc) VMM: don't fail if AMD-V isn't available if the VM is configured to use software virtualization VMM: fixed PATM saved state incompatibility for software virtualized VMs (bug #12222)

VMM: fixed TPR threshold which caused BSODs on Windows XP guests that use the I/O APIC (VT-x only bug #12227) 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: provide fake values for a couple of MSRs to make more guests happy on certain hosts 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)

Virtualbox mac os x guest freezes