Black video thumbnails in iPhoto (Mavericks)

Hello everyone.
I have Mavericks on a late 2012 Macbook Pro running iPhoto 9.5.1.
I recently noticed that rough a third of my videos were displaying thumbnails that are just black.  I freaked for a second, thinking the movie files were gone or something but thankfull the video files are still there and play just fine.
Still it would be nice to see that the video thumbnail images are rather than just black rectangles, right?
I tried all the different iPhoto rebuilding options (which takes a heckuva long time! ... then purchased iPhoto Library Manager and attempted some rebuild options using that with no luck.
Wondering if anyone has had this issue too and/or solved it?
Cheers!

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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