A DV-AVI slide-show video I made awhile ago, which formerly played without problem thru the Windows Media Player, suddenly has begun to jitter, noticeable particularly in still shots of black printing on white paper. The audio track music is fine. I have made two recent changes - updated my video display drivers, and moved the video from my C-drive to my external Firewire drive, which contains only video. Could either change have caused this problem? Other ideas?