How Do I Fix Thumbnails That Bring Up The Wrong Image?

I am very frustrated when I go into aperture and look at my pictures I look at the previews on the bottom and there are a lot of preview photos are the wrong photo. When I click on the photo a different photo comes into the view screeen. What can I do to fix this I tried holding option and command while I started aperture and it said it was regenerating. Afterwards still the same result. Any other suggestions? Also when I click on library now nothing displays in the view window? THanks

It looks like your thumbnails have been corrupted. Rebuilding the database won't fix that, so you'll need to delve into the affected library. It's easy to fix.

Another symptom of corrupted thumbnails is that they look like this:
thumbs1
To fix, quit Aperture and locate the Aperture library with the problem. Control-click on the library icon and select Show Package Contents:
thumbs2
A Finder window will open. Navigate down through the folders (they correspond to the blue folders in your Aperture library) until you get to the project with the problem thumbnails:
thumbs3
Open that project with a control-click Show Package Contents and locate these three files:
thumbs4
Drag those to trash, or select them and hit command-delete.

Close the windows that you opened, and launch Aperture. Aperture will immediately start regenerating the thumbnails, and that could take a little while. To see what it is doing, click on Window > Show Tasks List and you'll get a count-down of the number of images still to process:
thumbs5
When it is done, all should be well, at least with that project. You'll need to repeat this with each affected project in the library.
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