I can confirm the analog VGA issue. I have a 2012 Mac Mini server with the Thunderbolt to VGA adapter. When I reboot my Mini with the adapter connected the Mini gets stuck in a rapid restart loop that I can only stop by pulling the power cord. The Mini chimes about once ever second when stuck in the loop never getting to the grey apple.
However, if I reboot without the VGA adapter plugged in the Mini restarts just fine. I then plug the adapter back in and everything seems fine.