Video thumbnails scrambled, won't playback (v3.4.3)

My video thumbnails in Aperture (version 3.4.3) are scrambled. Sometimes I can see part of a reference thumbnail frame (often in monochrome or with a single color overlay, like green), sometimes it's just all snow.
1) I just restored my mac mini from a time machine backup.
2) I also just imported an iPhoto library
If I browse to a pre-existing (before Time Machine restore) Aperture project, the correct thumbnail appears briefly before changing to the scrambled version.
When I select the video for playback all I get is a blank Viewer window (not video content, no controls, no playback).
If I browse to the source file via finder the video thumbnail displays and the video plays back correctly.
I have tried:
1) verifying and repairing disk permissions
2) repairing Aperture permissions
3) repairing the Aperture database
4) rebuilding the Aperture database
5) regenerating thumbnails (select video Photos->Regenerate Thumbnails) (thumbnail changes, still scrambled)
I don't use Aperture often so I'm not 100% sure when this started, but it seems to be after this current restore as supported by the brief correct appearance of old video thumbnails before they update to the scrambled version.
OS X 10.8.2
Aperture 3.4.3
Example of affected video:
IMG_0002.MOV
QuickTime movie
5MB
640x480
Duration: 00:11
Capture Source: iPhone 3GS

I suggest to check the video codecs you have installled; if you use Perian or have a flip-camera, you may have an incompatible video codec installed, see: http://support.apple.com/kb/TS4155
Why was a TimeMachine restore necessary? And did you use any helper/uninstaller/cleaner utilities, before you made the backup or after restoring? Sometimes this kind of helpers remove too much. I this case you may need to reinstall Mt. Lion to restore missing system components, that are not included in your TimeMachine backup.
Have a look at this thread Re: Import video to Aperture library on Mountain Lion,
and also at the post: Re: Import video to Aperture library on Mountain Lion in the same thread.
To reinstall from the "Recovery partition" see Linc Davis's post here: Re: Garageband doesn't open in Mac Mini mid 2011
Regards
Léonie

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