This is a maintenance release. The following items were fixed and/or added:
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VMM: several fixes
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GUI: fixed screenshot if the VM is started in separate mode
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GUI: fixed issue with double-click/opening registered file types (.vbox and .vbox-extpack) on Mac OS X (bug #15648)
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GUI: fixed a bug which made it impossible close some error/warning messages using the close button
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GUI: weakened the control over the VM window behavior allowing to resize it across multiple screens and to use in Snap Assist techniques
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GUI: jump to the second tab of the session information window (5.1.0 regression)
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GUI: fix for Alt-Tab
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Storage: fixed creating fixed size VHD images (bug #15601)
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Storage: fixed a hang during power off if the VM was suspended before and a NVMe controller is configured
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USB: fixed a crash under certain conditions
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Audio: make AC'97 volume control work again (5.1.0 regression; bug #15598)
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Audio: fixed rare VM hangs when using AC'97 emulation
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Audio: SB16 fixes
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EFI: fixed access to devices attached to SATA port 2 and higher (bug #15607)
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OVA: fix for checking certain signatures
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OVA: fixed MAC address generation for appliances created by VirtualBox (5.1.0 regression; bug #15623)
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API: fixed audio settings handling for older config files (bug #15626)
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API: fixed truncation of USB product/vendor IDs on Linux hosts (5.1.0 regression; bug #15644)
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API: fixed VRDP with authentication (bug #15653)
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API: don't crash if there is no graphics controller configured (bug #15628)
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Linux hosts: fixed EL5 builds (bug #15634)
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non-Windows hosts: fixed a crash during shutdown under rare circumstances (bug #15568)
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Linux Additions: fixed SELinux issue which prevented certain Linux guests to work in 3D mode (bug #15574)
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User Manual: updates