I have encountered a persistent graphical glitch in the BP at the start of the 'Ken' mission and the bit in UT2 where you the screen goes black and you 'must not turn around'. I get solid white squares coming out of the screen at me, similar to motion debris. It only happens at these points in these two missions, so it's not game breaking, I just curious as to whats causing it. They do not appear in the various 'lets plays' I have checked on YouTube so I'm guessing something has gone wrong somewhere. I have uninstalled/reinstalled but this didn't help. Any ideas?