Why are videos in iphoto black thumbnails after import?

Hi,
I had to rebuild my entire iphoto library and start fresh but after i did that a lot of the small thumbnails are black when i view my photos in events.
I can correct that my making one photo in the event the key photo but all my videos in iphoto now have black thumbnails instead of the usual picture preview.
I'm upgrading them all just now to see if that helps but it's taking hours.
Any ideas anyone?
J.

Now i just need to mess about in the finder and delete some things and then move some stuff about and that should be that!
Not sure what that is all about but you know that you must NEVER make any changes of any sort to the structure or con ten of the iPhoto library - there are no user serviceable parts in is - any user activity inside the iPhoto library will corrupt it and cause data loss
LN

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TD:
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Why are videos in iphoto black thumbnails after import?

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