If you're cutting in a Dv timeline, you should be using 48,000khz audio, not 25,050(?)khz.
Also, it's going to be a small, poor quality picture in the middle of your frame, or get blown up to compensate and look terrible. How come you're exporting it so small and at only medium quality, as an MPEG?
Jude's right, just export from Avid using the QuickTime NTSC DV codec and check to see that it's 48K audio too. Sample rate issues can cause synch drift during realtime playback on either system.
- Loren
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Just checking: What was the original format of the clips and timeline in the Avid XPress Pro? I cut a short film last year that was using Avid XPress Pro to edit HDV and sync was an insufferable problem. I was able to export a DV NTSC movie file of an earlier cut, but when the director, producer and previous editor tried, the sync went all over the place.