Yeah, I'm completely shooting in the dark here myself, but when was the last time you defragged your hard drive? Glitches happen. Is your hard drive over 75% capacity? Same thing (which makes me wonder why this is a serious problem and the manufacturers don't just labels their drives to the 75% capacity in the first place...?). This is a particular problem for video editing, but can produce some headaches for graphics packages like PS and Painter. As far as the video card, how old is your computer? Meaning, if you've got a Mac G4 or a Pentium3 and you put in a Wildcat card it might not be able to handle it - new drivers or not. This could be a redraw issue for incompatible hardware. How old is your computer in general (or for that matter, specifically, your hard drive - getting old is not good) - does it meet the "minimum" specs required by PS (say, G3 or Pentium3, w/128MB RAM), or does it meet the "reccommended" specs (G5, Pentium4, or Athlon, w/512MB RAM)? Makes a big difference. Maybe drop in a list of whatcha got, and how long this problem has been going on. "It's doing this" can be a VERY vague question for computers. -Lew ;-)