IPhoto 11 is not playing .mov files

I am haing some problem with iPhoto 11 and was wondering if anyone can shed some light on my issue
1) mpg files play fine.
2) Small file size .mov files ONLY play the audio.
3) Large .mov files from my iPhone 4S cause iPhoto to freeze.
4) I can find the original files via Reveal In Finder so I know everything is linked together correctly.
If anyone can help me fix this issue it would be appreciated
John

Yes that's QuickTimeX.
As a Test:
Hold down the option (or alt) key and launch iPhoto. From the resulting menu select 'Create Library'
Import a few videos into this new, blank library. Is the Problem repeated there?

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IPhoto 11 is not playing .mov files

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