iPhoto - Repair Thumbnails

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To repair the thumbnails of iPhoto.
  • First close all running instance of iPhoto.
  • Press and maintain these 2 keys:
  • Command and Option keys
  • Open iPhoto.
  • A small dialog with repair option shall be displayed.
  • Release the keys
  • Check "Rebuild all of the photos' thumbnails" and click on Rebuild.

iPhoto - Repair Library file permissions
iPhoto - Repair Library database