Black images when trying to view other user's added photos in iPhoto

Hi all - I've had this problem for ages and really want to get to the bottom of it.  We have 1 iMac that has iPhoto '09 with the library in a shared folder so that both myself and my wife can import pictures into the 1 iPhoto library.  So... 1 iMac, 2 users, 1 iPhoto library.  It works somewhat... but there seems to be a big problem when I open iPhoto (no other user even logged into the computer) and as I browse through the library, many of the photos my wife has imported have thumbnails, but enlarge to black.  Same thing in reverse, it seems to have a problem with many of the photos I've imported if my wife logs in and scrolls through the iphoto library.  It's not every picture but it is a good chunk of them.  The thumbnails are there... and when I log in under my name, I can view all the ones that were "blacked out" when my wife was logged in (and vice versa), so the images aren't gone.  How can I repair this once and for all???  I just want a fully functioning iPhoto that both my wife and I can trust.
THANKS!!!

There are several possible causes for the Black Screen issue
1. Permissions in the Library: Back Up and try rebuild the library: hold down the command and option (or alt) keys while launching iPhoto. Use the resulting dialogue to rebuild. Include the option to check and repair permissions.
2. Minor Database corruption: Back Up and try rebuild the library: hold down the command and option (or alt) keys while launching iPhoto. Use the resulting dialogue to rebuild.
3. A Damaged Photo: Select one of the affected photos in the iPhoto Window and right click on it. From the resulting menu select 'Show File (or 'Show Original File' if that's available). (On iPhoto 11 this option is under the File -> Reveal in Finder.) Will the file open in Preview? If not then the file is damaged. Time to restore from your back up.
4. A corrupted iPhoto Cache: Trash the com.apple.iPhoto folder from HD/Users/Your Name/Library/ Caches...
5. A corrupted preference file: Trash the com.apple.iPhoto.plist file from the HD/Users/ Your Name / library / preferences folder. (Remember you'll need to reset your User options afterwards. These include minor settings like the window colour and so on. Note: If you've moved your library you'll need to point iPhoto at it again.)
If none of these help:
As a Test:
Hold down the option (or alt) key key and launch iPhoto. From the resulting menu select 'Create Library'
Import a few pics into this new, blank library. Is the Problem repeated there?

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