It's a known issue.

I just talked to some of the guys who avtually wrote directx... The issue is with the ATI drivers that ATI gave to Microsoft. When it clips a triangle, it sets its axis to 0,0,0 which is the upper left corner of the screen. That is why you get all those funky lines.

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Matt
AKA ShadowKing
"If you want to make an apple pie from scratch, you must first create the universe."