IPhoto 8.1 ('09) Corrupted thumbnails

All my thumbnails are now in Black & White, some are skewed like an old TV picture.
Have used the alternate launch of iPhoto and hit every single checkbox in the list to rebuild the thumbnails, 4 or 5 times already... including restore from database...
The photos look normal when I click on a thumbnail and they export correctly.
Has anyone experienced this? Has anyone found a solution? Any help will be most appreciated. I would include a screenshot, but don't quite know how.
Thanks in advance!
Message was edited by: Dutchman15

Hi Neil and Larry,
Thanks for your help. Backup is always a good idea. Will the newest iphoto version automatically replace 8.1.2 and will the current photo library be imported into the newer iphoto app?
Judesterous

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