Blank video thumbnails in iphoto just started appearing!

Importing videos from both iphone 4 and 4s fine until 14th December, but any imported since have black thumbnails. Videos work fine and show up as thumbnails on phones. Help please.

Thanks for the quick reply!
I triple checked a handful of the video files and they aren't exhibiting black at the start.
How I checked:
- Select black video thumbnail image
- Press space bar (to "zoom" and begin playing video"
- Stop video playback at approx. five seconds in (video counter reads 00:00:05)
- Rewind "playhead" to very start of video so that the counter reads 00:00:00 and there is definately an image / content being displayed (e.g. is not black)
See attached screen shot with playhead at 00:00:00

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Thanks for the quick reply!
I triple checked a handful of the video files and they aren't exhibiting black at the start.
How I checked:
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See attached screen shot with playhead at 00:00:00

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Thanks for the quick reply!
I triple checked a handful of the video files and they aren't exhibiting black at the start.
How I checked:
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See attached screen shot with playhead at 00:00:00

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Message was edited by: Old Toad

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Blank video thumbnails in iphoto just started appearing!

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