Thumbnails turn to mush in front of my eyes!

Very bizarre--as I open up iPhoto (5.0.4) several of the thumbnails turn into pixelated nonsense. THis effect spreads out as though it were a (gasp!) virus! Have run "repair permissions" and "repair HD" from TIger start-up disk. Everything checks out OK via that. When I close and then reopen iPhoto the same thing happens--starts out normally and then the thumbnails start to turn on me! When i click on these hyper-pixelated images I get a big old blank for the image.
Any thoughts? This is really weird!

Hi douglas,
If it were just the thumbnails being messed up I would suggest a rebuild of the library.
Try this:
Before doing a rebuild make sure iPhoto's trash bin is emptied. You can do this by control clicking on the trash bin, or from the menu bar under iPhoto.
Close iPhoto
Duplicate the iPhoto Library folder
Drag the duplicate to the desktop (hopefully you have enough room on your hard drive for the duplicate.)
Launch iPhoto holding down the Command and Option keys until you see the rebuild options screen.
Choose the first three options. If you were missing photos in your library, also choose the last option. Be advised that you will get a roll of orphaned photos and it might be quite huge. Most of them will already be in your iPhoto library, but use caution when deleting anything from this roll until you are sure the photos are still in your library in another place. It might be a good idea to share/export this roll of photos just in case you need to import them again.
Back to the rebuild, depending on the size of your library it might take some time. When it is done, hopefully your photos will be there.
You might see some unexpected results as I did when I did a rebuild. Photos had been moved to wrong dates, video clips had lost their duration info and some were even orphaned from the jpg pointer file. It took me some time to straighten it out again.
This is the reason to make a duplicate before you rebuild, in case you do not like the result. If you don't like the result, close iPhoto, then delete the rebuilt library and drag the duplicate back into the Pictures folder making sure the name is iPhoto Library. Launch iPhoto and it should open the library in the Pictures folder.
The problem is, you said the image does not appear when the thumbnail is double clicked. So it is just not the thumbnail. The thumbnail lost the link to the image.
Can you remember doing anything right before this happened. Anything in the iPhoto Library folder in the Finder? Any crashes or force quits?

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drummer914 wrote:
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PHP can only be run from a server.
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Replies to Curt and Omke:
In original post you said you were running Win XP, so it that home computer and work is Win7?
Work PC = Win XP, Photoshop CS5, Dual-core processor and 4 GB RAM. Home PC = Win7, Photoshop 5.0, Quad-core processor and 4GB RAM. Both are 32-bit OS. I cropped and saved 20 of these TIFs on the home Win7 machine, and had no problems with black images at any time. I tested those same TIFs on a work machine that is identical to my Win XP work machine, and had lots of problems with them turning black. This suggests that the OS, video card and/or CPU are causing trouble on the work machine, not necessarily the RAM. It doens't seem to be a problem unique to my PC, but rather to all the PCs that are just like my PC (our organization buys in bulk, and we all have identical PC setups).
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