This is a maintenance release. The following items were fixed and/or added:
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GUI: mouse events did not reach host windows behind the transparent VM window (Mac OS X hosts only; bug #16246)
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Audio: fixed accidental crashes when using the AC'97 sound emulation (bug #16959)
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Audio: fixed crash when default input or output devices have changed (bugs #16968, #16969, #17004)
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Audio: fixed recording when using the ALSA backend
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Audio: fixed handle leak when using the OSS backend
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E1000: fixed a crash related to VLAN traffic over internal network (5.1.26 regression; bug #16960)
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NAT: apply --natbindip1 to TCP connections (bug #16478)
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OVF: when importing an appliance with XHCI controller, don't add an OHCI controller
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Mac OS X hosts: fixed a GUI crash if Spotlight is used from file dialogs (5.1.20 regression; bugs #16935, #16953)
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Linux hosts: fixed creating fixed sized VDI images (bug #17010)
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Linux hosts / guests: fixes for Linux 4.4 of openSUSE Leap 42.3 (bug #16966)
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Bridged networking: align outgoing packet at word boundary, preventing Windows host crash in MsLbfoProvider
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Linux Additions: kernel drm driver support for custom EL7 Linux 3.10 kernel
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Solaris Additions: hide an informational message on the bootup console