Black Thumbnails & Previews

I've had a problem pop up recently, a number of my pictures are now showing up with black thumbnails and previews.  I have tried everything, deleting and re-generating both, repairing permissions, rebuilding database, even working on another computer and nothing works.  Aperture just keeps creating the same **** BLACK jpegs.  I can see/open the original jpg in preview/photoshop, etc and it is ok. Dunno where to go from here.....

Lion with the latest Aperture.
Yes, the original images (JPGs taken on the camera) are ok.  I can see them tucked away in my Apeture Library folder.  When i delete and regenerate previews and thumbnails Aperture creates jpgs that are black. I tried using the same library on a different computer by booting my laptop into target disk mode and got the same result.
I finally gave up trying to fix this, and instead deleted all those photos.  I have a 'master' library i import all my photos into before moving them to my 'live' library (that doesn't include the RAWs) so i just reimported for that library.

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