i've had it happen time to time, where i have an image before some video, and the video drops about 2 frames at the start. i've always managed to get around it by puting a 2 frame cross fade transition between the image and video.
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-Bizzare
Specs:
PowerBook (Firewire)
500 mHz
256 MB RAM
18 GB HD
AirPort
OS 9.0.4