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jab: I'm on the laboratory chapter and I seem to have reached a wall due to a bug that I'm having.
Whenever I move the cursor around the screen it goes in and out like a flickering light. For the last chapters it wasn't game breaking. But the puzzle to unlock the door using the chalk boards is impossible.
If it helps I'm on XP sp 3, nvidia gtx 260 , 4 gigs of ram , and an amd X2 4400 processor.

Sorry to hear that - please raise an issue with support and provide a dxdiag if you can.
You won't get a response today as Wednesday 11 November 2009 is a bank holiday for the whole team.
Please send us an error report using the Support -> Contact Us form. Make sure you include as much detail as possible and a DXDiag.txt file - this will help us a lot. As soon as we are able to recreate the problem, we'll see what we can do about fixing it.
Post edited November 13, 2009 by Firek