" Also to be mentioned " that Poser 13 since the beginning when moving a floating window, in my case the preview screen it is causing Poser to flash, getting white lightning effects, in some cases over the whole surface, but mostly on the left or right side. Might also be the root cause of your black screen just with another symptom. Might just be my system who knows but also the only program I have that is causing such lightning flash effects when moving a window so " Not Win or Drivers for sure " 

Actually this happens on any window if set as floating in P13, it just flashes Poser :)