VirtualBox 4.3.14 is a maintenance release. The following items were fixed and/or added since VirtualBox 4.3.12: VMM: more fixes for MSR emulation on certain hardware (bugs #12784, #12949, #13034) VMM: improve MSI handling under rare circumstances (only relevant for the ICH9 chipset) VMM: fixed #UD exception for 64-bit guests with the EFER.SCE bit and the SYSCALL instruction (VT-x only; 4.3 regression; bug #13008) VMM: fixed timekeeping after resuming SMP guests VMM: properly wake up a halted VCPU on NMI/SMI GUI: fixed a potential crash GUI: fixed stuck AltGr key on Windows hosts (bug #2537) GUI: fixed a potential error during the version check GUI: shortcut change should not require Enter/Return (or other trigger) to confirm (bugs #12828, #12847, #12937, #13087) GUI: fixed update check which was broken due to changing the location of the root certificates (bug #13096) VBoxManage: fixed typo in showvminfo --machinereadable (bug #13176) NAT: fixed inbound half-close (bug #13116) NAT: fixed slow upload speed under certain conditions (bug #10034) NAT Network: fixed potential loss of inbound TCP data NAT Network: fixed potential infinite stalls of TCP connections over IPv6 NAT Network: fixed resets of TCP connections on Windows hosts NAT Network: fixed inbound half-close on Mac OS X hosts NAT Network: fixed socket leak on Solaris hosts NAT Network: fixed ping of mapped host loopback on Mac OS X and Solaris hosts, fixed proxying of IMCP errors on Mac OS X Host-Only Network: fixed SNMP ifConnectorPresent value on Windows (bug #13143) Storage: fixed a possible crash with CD/DVD passthrough under certain circumstances Storage: fixed a crash when trying to open an inaccessible QED or QCOW image (bug #12613) Storage: fixed data corruption or read errors under rare circumstances AHCI: fixed a crash under rare circumstances USB: performance fixes ICH9: properly reset MSI capability on reset Keyboard: active modifier keys during suspend were stuck after resuming the host 3D: fixed misbehavior with huge guests (i.e. guest more than 4GB guest memory 3D: several fixes API: properly detect the Windows 8.1 guest OS type (bug #13090) ExtPack: cleanup of dangling uninstallation directories Linux hosts / guests: compile fix for EL7 (bug #12638) Linux Additions: made 3D pass-through work with recent versions of Mesa in the guest (bug #12941) Linux Additions: Linux 3.16 fixes (bug #13123) Mac OS X hosts: when scanning for host CD/DVD devices also consider BlueRay devices OS/2 Additions: fixed gengradd.dll library name (bug #12785) Solaris Additions: fixed permissions of files and directories located on shared folders Windows host installer: fixed the need for rebooting Windows after installation or upgrade, extended logging for NetFlt/NetAdp (un)installation