Quicktime X crashes on playing video ...

After installing Snow Leopard, Quicktime X will not play any of my video files. It crashes after I select a movie file from the menu. These are MP4, MOV and Avi previously created with QT7 and iMovie 09. I installed the QT7 from the Snow Leopard disk with the same results. All movie files play on the remaining Leopard (not upgraded) Mac.

Any Idea?

Thanks, Dale

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Orignal From: Quicktime X crashes on playing video ...