Finder-coverflow shows green thumbnails for videos

Hello,
somehow my coverflow in finder shows green thumbnails for some of my videos. I can open them, and they would also play in quicklook. Once i had opened them with quicklook, the normal video-image is also be seen for some moments after i quit quicklook. see the gallery below for screenshots.
Any ideas?
It occirs only with mpeg4-avi-files. All other .avi-files show normally.
http://www.imagefap.com/gallery/1221328
Thanks,
Frappermeister

I had success with Ai's File > Save As... command on .ai files that have no preview and show only the .ai logo. 
File > Save on non-preview files keeps the old properties, while Save As...creates a file with the new properties including the thumbnail preview.
In the Save As... dialog, I use Version: Illustrator CC (17.0) and check Create PDF compatible file and Use compression.
I'm running Mavericks 10.9.1

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