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