I had a similar thing happen on another game once, and spent months trying to track it down, as it was first intermittent but then grew progressively worse. It ended up being my graphics card going bad...
So I contacted ATI and had it replaced under warranty. I'm not saying for sure that this is your issue as well, but if you get lot of responses and try everything you know of and it still happens or grows worse, especially the flickering, then maybe look to the card itself.
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