I've hit a problem where Windows simply won't restart—it merely drops down into Locked mode with the session still active.
I've tried shutting down (as opposed to warm booting under restart) and running shutdown.exe from the command line. All have the same affect—the system Lock Screen appears immediately and the VM refuses to budge another inch toward an actual restart/shutdown.
Tracking this down promises to be a sticky one. Has anyone else seen this?