This is a maintenance release. The following items were fixed and/or added:
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GUI: the update check now uses the HTTP system proxy settings by default
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GUI: About dialog improvements. Copyable version text, do not close dialog on mouse-clicks and focus losing, explicit close button at the bottom of dialog and disabled close button fix on OS X. (bugs #9912, #12749)
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GUI: fixed bug when re-assigning shortcuts (bug #14565)
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GUI: fixed default focus button in message-box dialogs (bug #14486)
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GUI: fixed settings dialog which is opened if the network settings need to be changed at VM startup (5.0 regression; bug #14601)
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GUI: fixed crash during VM start if an early error message needs to be shown, for example Linux kernel modules not present (bug #14646)
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Bridged Networking: fixed handling of guest DHCP requests without UDP checksum when bridging to a wireless interface (bug #14615)
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Audio: latency fixes (Windows hosts only; bug #4088)
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Guest Control: correctly set USERNAME and USERPROFILE environment variables (Windows guests only)
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Guest Control: several fixes
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API: properly restore NAT port forwarding rules when reverting to a snapshot
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Parallel ports: Several fixes allowing to enable two parallel ports for a VM
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VBoxManage: fixed wrong output of debugvm show command
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VBoxManage: fixed hang when specifying logging groups with debugvm log starting with h, for example hex
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Windows hosts: renamed VBoxStartup.log to VBoxHardening.log and provide this log file in the GUI log viewer
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Windows hosts: fixed a small memory leak in the Windows host interface driver (VBoxNetAdp) which caused a BSOD if the driver verifier is enabled (bug #14562)
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Windows hosts: fixed a failure to start VMs on hosts where dsound.dll is not available (bug #14574)
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Windows hosts: another fix for VERR_LDR_MISMATCH_NATIVE errors (bug #14579)
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Windows hosts: fixed host-to-guest communication with bridged networking (bugs #14326, #14457)
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Windows hosts: fixed broken data receiving from the serial device with the named pipe backend if Kaspersky AV is installed
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Linux hosts: Linux 4.3 compile fixes
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Linux hosts: installer fix for certain systems (bug #14627)
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Linux hosts / guests: native systemd support for the host/guest installer scripts. The scripts for re-compiling the kernel modules are now located at /sbin/rcvboxdrv (host) and /sbin/rcvboxadd (Guest Additions)
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Mac OS X hosts: GUI-related fixes for El Capitan
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Mac OS X hosts: fixed a problem with capturing USB devices under El Capitan
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Mac OS X hosts: allow colon character on shared folders (bug #14554)
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Linux Additions: properly set the VBoxService process ID in the PID file (bug #14571)
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Linux Additions: Guest Control fixes (bug #14573)
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Windows Additions: fixed shutting down VBoxTray when running with older VirtualBox host versions
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Windows Additions: fixed video playback with VLC and Windows Media Player when the WDDM driver is used and 3D is not used
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Windows Additions: prevent a possible VLC crash when the WDDM driver is used and 3D is enabled by implementing YV12 surfaces