This is a maintenance release. The following items were fixed and/or added:
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VMM: added support for guest crash report MSRs with Hyper-V paravirtualization
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VMM: fixed an issue causing artificially high load averages on Linux hosts
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VMM: fixed a kernel panic with thread-context hooks caused by incompatible changes made to Linux 4.2 kernels
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VMM: fixed a saved state issue with VT-x/AMD-V disabled (5.0 regression; bug #14304)
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VMM: fixed VERR_SUPDRV_TSC_DELTA_MEASUREMENT_FAILED Guru Meditations on certain AMD CPUs (5.0 regression; bug #14370)
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VMM: fixed a crash while creating a guest core dumps via the VM debug facility (5.0 regression)
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VMM: This release has AVX2 passthrough disabled on every host and AVX passthrough disabled for 64-bit VMs on 32-bit hosts. This will be properly fixed in a future 5.0.x maintenance release (see e.g. bug #14262)
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GUI: fixed rare hang and crash on VM shutdown/poweroff
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GUI: X11: fixed few crashes caused by the Qt alien widgets feature
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GUI: X11: fixed various mini-toolbar geometry quirks like positioning, z-order, transparency issues on certain window managers (bug #14257)
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GUI: X11: fixed mini-toolbar minimize button issue under certain window managers (bug #14284)
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GUI: VM menu actions availability should now be properly updated on full-screen/seamless/scaled mode switches
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GUI: disk encryption password validation should be performed when user confirmed the password, not after each entered symbol
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GUI: do not change the VM/group selection in the VM Manager to the newly created VM if it was created by another client (e.g. VBoxManage)
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GUI: Mac OS X: do not treat 'almost maximized' VM windows as 'maximized', watch for the strict window geometry instead
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GUI: improve the quality in scaled mode under some circumstances (5.0 regression; bug #14303)
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VBoxManage: do not deny changing the network adapter type at VM runtime (5.0 regression; bug #14308)
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VRDP: allow Windows 10 RDP clients (bug #14216)
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Audio: fix a possible crash on VM process termination (5.0 regression)
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Storage: improved raw disk access on OS X by unmounting any accessed volume before first use and prevent any mount attempt by the host (bug #14219)
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3D: basic support for saving/restoring display lists
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Drag and drop: fixed guest to host transfers on OS X hosts
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Drag and drop: fixed memory leak on Windows guests
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Shared Folders: fixed a problem with accessing CIFS shares (bug #14252)
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Shared Folders: improved path conversion between hosts and guests with different path separators (bug #14153)
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API: skip resetting of immutable media when the VM in saved state is started (bug #13957)
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API: fixed method for setting medium IDs which used zero (invalid) UUIDs instead random (valid) UUIDs if no UUIDs were passed (bug #14350)
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API: for Windows host fix detection of API client crashes which have a session open
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OVF: properly export all VBox features including the setting for paravirtualization (bug #14390)
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Mac OS X hosts: El Capitan USB fixes
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Windows hosts: fixed crash when opening Windows dialogs from the VM process on Windows 10 (bug #14351)
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Windows hosts: fixed host-only adapter creation issues on Windows 10 (bug #14040)
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Windows hosts: fixed audio on Windows 10 (bug #14432)
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Linux hosts: more fixes for activated SMAP on Linux 3.19 and newer (Broadwell and later; bug #13961)
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Linux hosts: check then name space before attaching to a host network interface (bug #13795)
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Linux Additions: Linux 4.2 fixes (bug #14227)
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Linux Additions: improved the performance of stat() to speed up certain file operations on shared folders
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Windows Additions: fixed a potential crash in the WDDM driver with Windows 10 (bug #14190)
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Solaris Additions: added support for X.Org Server 1.17
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X11 Additions: various seamless mode fixes, including invisible windows under LXDE