Oh, oh! Not Again!!!! Rebuild Thumbnails Message...

A few weeks back I began getting frequent Rebuild Thumbnail messages when I launched iPhoto. Eventually, despite the fact that I'd been faithfully rebuilding as instructed, the Last 12 Roll option began to malfunction via displaying rolls with incorrect date sequences. When this occurred I first tried the Rebuild Library option within iPhoto. This didn't rectify matters so I downloaded Library Manager and ran it. Still no luck so I reverted iPhoto back to an earlier Library6.iPhoto and things magically were fixed. Or at least they seemed to be at the time.
Two days ago I began getting the Rebuild Thumbnails message again and I fear I am headed back into difficulties. I have no idea why this is happening and since the security of my photos is extremely important to me I wouldn't mind finding out so that I can keep it from happening again. Anyone have any idea of what might be causing the Rebuild Thumbnails message to display so often?
Also, the other day when I backed up the current Library6.iPhoto I did so by highlighting the file, selecting Duplicate, and then renaming the duplicate created with that day's date... as in 090114Library6copy.iPhoto. I then dragged the file into a folder named iPhotoLibrary6 Backups. When I launched iPhoto the next day it couldn't find the library so I had to use the select library option. Any idea why this would happen?
Last, but not least, after a few months of using iPhoto I would have to say that the application is a good deal more capable than is indicated by the "Mom & Pop Photo Manager" label that is often applied to it. In fact, as a fairly skilled professional photographer whose images are usually pretty decent quality I would have to say that iPhoto is all I need for processing my images about 97.3% of the time. The more seat time I have with the application and the more I get used to using the various tools offered the more amazed I become with the power of this application to create truly stunning images. My one reservation has to do with the issues I've been experiencing with database glitches.
Thanks,
Winston

I love iPhoto for many reasons but it is sensitive to database issues
Therefore backup a lot
I make a daily clone to an external hard drive, just purchased a 1 TB Time Capsule which I have not received yet and use Old Toad's automator script often when I have loading and modifying photos - knock on wood I have not yet had a problem that even required me to use these
I am hoping that Apple improved the database operation in iPhoto '09 - it clearly is too sensitive to disruption and needs improvement
All of that being said you are very unlikely to ever lose any photos with iPhoto - the worst that I've ever seen iPhoto do is lost track of them and fixing that causes yo to lose your edits and keywords and projects - not good but better than losing photos
If you get a good clean library, use Old Toads script religiously and back up often you will not lose anything short of a massive failure of your entire computer
LN

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