Well, I don't have some hair brained idea of why it's doing it, but I've recently discovered, working at blockbuster (sigh), that certain DVDs will not play, or play badly, in certain DVD players. I have a bunch of people coming back saying it won't work well in one DVD player, but fine in others, etc. How fast is your computer and DVD rom drive? Maybe too slow to keep up? Is it set to the right region? I'm just thinking out loud.