Warning fix is no good...
WARNING: I have tried this fix a few times, and the system becomes unstable and eventually CRASHES. Best to stick with single monitor mode until this bug is fixed --It is a royal PITA.
I just tried this and it fixes the issue. If I enable multi-monitor support once the VM is booted, it remains fixed. Unfortunately, as soon as I reboot again, the problem is back, so I need to remember to do this every time I start my VM. I did open up a ticket (663077) with support. They had me try build 3810.237520 which did NOT resolve the problem. At least the hack of disabling multi-monitor support still works.
WARNING: I have tried this fix a few times, and the system becomes unstable and eventually CRASHES. Best to stick with single monitor mode until this bug is fixed --It is a royal PITA.