Main: always expose the DMI memory information to Windows 2012 guests (bug #12017).

Main: don't automatically enable 64-bit guests on 64-bit hosts if VT-x/AMD-V is not available (bug #12424).

GUI: fixed warnings in VM settings / number of guest processors (bug #12480).

GUI: fixed deleting of inaccessible VMs (4.3 regression, bug #12205).

VMM: added a few more MSRs to the whitelist required by certain guests (bug #12245).

Unfortunately, VBox 4.3.4 produced broken saved states for this configuration so you have to discard these states (bug #12414)

VMM: fixed a VERR_SSM_STRUCTURE_MAGIC error when trying to load a saved state made with VBox 4.3.4 when VT-x/AMD-V is disabled.

VMM: fixed a Guru Meditation VERR_SVM_UNEXPECTED_EXIT while intercepting debug register accesses (AMD-V only bug #12481).

VMM: fixed a Guru Meditation VERR_VMX_UNEXPECTED_INTERRUPTION_EXIT_TYPE while intercepting debug exceptions (VT-x only bug #12410).

VMM: fixed a Guru Meditation VINF_EM_TRIPLE_FAULT caused by VMCB caching with nested paging on certain AMD CPUs (bug #12451).

The following items were fixed and/or added:

X11 Additions: support X.Org Server 1.15 (bug #12623).

Linux / Solaris Additions: don't automount a shared folder which is already mounted.

Linux Additions: fixed CPU hot-remove on newer Linux kernels.

Linux Additions: support Enterprise Linux 6.5 kernels (bug #12505).

Guest Control: fixed setting and using a guest user's process environment variables.

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