Editing video file in Quicktime Pro and producing a file which doesn't play

Hi all,
I have been editing some mp4 video in Quicktime Pro by setting the in and out position markers and cutting out segments (commercials). I save the file and end up with a .mov file which plays fine in the Quicktime player. (The file is a self-contained Quicktime movie.) At some point in the future, though, when I go to open the file in the Quicktime Player, only the audio plays. The video does not play, and the file opens as if it contained no video. That is, the Quicktime Player only shows the audio controls, and there's no area for video.
The same file plays fine in a Finder window when using CoverFlow/QuickView mode, which is very strange to me since I assume that uses the same Quicktime engine. It also plays fine in VLC.
Any ideas? It seems like there's some attribute on the file which is telling the Quicktime Player not to play the video, only play the audio.
Thanks in advance,
Russ

Any ideas?
First thing I would do when the file opens as an audio only files is check the "Properties" window to see what it says on a track by track basis. I also might try re-compressing the edited file to see if this prevents whatever is going on.

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Editing video file in Quicktime Pro and producing a file which doesn't play

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