There are some odd issues with a QuickTime setting called the movie aperture. Try opening it in QT7 Pro, hit Cmd-J and go to the tab on the bottom which has an "aperture" setting. Try changing it to Clean, or maybe Classic, and save the QuickTime. I'm on my iPad now so if you don't see what I'm referring to, I'll post more detailed instructions.
Note this is just a display issue in QuickTime player and shouldn't affect the file compatibility with other players like Omneon, etc.
Jason Livingston
CPC Closed Captioning