Hi!
I have some problem when I mix video vob files. Some green/red stripes shows at the window. this will desipere when i close the hardware acceleratin in the video consol, but then I cant use my mix effect´s.
Had the same problem was using the ati 3870 video card, against the wishes of my computer builder. He warned me that ati's high end cards were problematic. I decided to not play videos for a while, so I could still have the vid effects. 3 weeks later my computer started crashing several times during a night. I pulled the ati and replaced it with the gtx 8800. Everything works great now. Ati card must have been bad. You might have a bad video card. I had orginally benchmarked my computer using futuremarks 3d benchmark 2006 version scored a 9300 just bench it agian last night with the new card and scored over 15000. good luck