Apokalypsia

I'm having the same issue, I've completed the quest by helping Nedmar to free he's acolyte, killing Osrya and the King Raedric, now when I try to get out the keep, I'm getting a black screen then the game become "not responding" I haven't think try to do print screen on the black screen to see what I'm seeing but so far I cannot continue my story I'm stuck inside the keep