MP4 video not playing

Hi,
I have the following setup:
Mac Pro w/ 2 NVIDIA GeForce 7300s
1 card is powering 2 - 23" Apple Cinema Displays and the 2nd card is powering my Plasma.
The Apple displays run at resolution 1920x1200 and the Plasma runs at 800x600 60Hz. NOTE: I convert DVI down to VGA to run to the Plasma with Apple's adapter.
The problem:
When uploading MP4 from HD camera to iPhoto, video image not showing in Quicktime on either of the cinema displays. But, audio works fine. If I drag the clip into iMovie HD it does NOT work either, only audio plays.
When dragging and dropping the same video clip into an email (Apple Mail), it will play fine in there. If I drag that Quicktime player over to the plasma display it will play fine there as well.
So, how can I get Quicktime to play on either cinema display at their running resolution of 1920x1200?
Goal: To edit video in iMovie HD.
TIA for all of your suggestions!
Kyle

I'll look into it. You may also want to try removing the viewer (remove from both iTunes and iPad, sync) and then adding the viewer again just to make sure it's not a memory issue with the viewer. I'll let you know what I find out.

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