On 15" Macbook Retina
Driving two external displays via HDMI and DisplayPort
Locking and unlocking the computer will prevent one of the displays (DisplayPort) from not driving, it is black but shows up in the display arrangement
Pulling the USB cable from the mac in anything but sleep mode will lock up the computer where it will no longer respond to mouse or keyboard input, and require a restart.
Trying to get logs now.