VMM: some XSAVE fixes
GUI: hot-plugging support for USB storage controller.
GUI: fixed icons for savestate/restorestate and some of icons for HiDPI aware Win/X11 hosts.
NAT: don't kill UDP bindings on ICMP errors (bug #13475)
Drag and drop: various bugfixes for Linux hosts and guests
Encryption: fixed cloning VMs
Audio: Fixed volume control for mono streams
Audio/SB16: Fixed loss of output after loading saved state.
USB3: fixed attaching multiple emulated disks to the xHCI controller
3D: fixed a crash on restoring the VM state (bug #12737)
Snapshots: fixed Beta 3 regression
VBoxManage: fixed reading the partition table on Windows
iSCSI: fixed a hang during power off if the initiator connects to the target over the internal network
VirtualBox 是一款功能强大的 x86 虚拟机软件，它不仅具有丰富的特色，而且性能也很优异。