Changing the game quality to low fixes the flashing screen problem. To do this, right click>quality>low and voila! I just can't believe the amount of morons there are in the world...
Actually it's luvly juvly. Sorry about my comment before, I was just pissed off because I was so close to killing the Maidchamberwhatever. I find it's much more easier with Dan Paladin, he's weaker but he gets the job done.