Same. Once I de-allocate the VM, I lose the ability to use the video device. Any attempt to revive it has been unsuccessful. I've tried to rebuild the VM with the same disk image, no luck. I've tried changing sizes, no luck. When I start a fresh VM and fresh drive, it's inconsistent if the driver and video device come online successfully. I've ended up spending $80 on just trying to get a new instance up and working again, then spend time to re-apply any of my own environment to it.