Random red frames inserted into my mpg's!

I'm using Encore 2.0 and just finished transcoding a film in Premiere 2.0. The outputted MPEG-DVD looks fine, so I import it into Encore, and when I'm setting the chapter points, I notice some frames flash neon red. I'm assuming it's something to do with bad frames? No idea why it does this because if I watch the film say in Windows Media Player, no red frames. But once it's in Encore 2.0 it inserts this corruption.

My setup: Windows xp pro, AMD Anthlon 3800+ Dual Core, 1Gig RAM, screen, mouse, keyboard. Anyone else have this problem?