A few weeks ago, when my partner who uses an iBook G4 opened iPhoto, he noticed that the sub-folders he created was gone. And some of the photos were gone too. Just this morning, he opened his iTunes, and the same thing happened -- the folders he made were gone and the songs he downloaded were gone too. I checked his directory, and I noticed the songs are still there and the photos are still there. It appears though that the directory was damaged somehow. And there was in fact an indication in iTunes that the iTunes library was damaged. I want to know what causes this. Why does it happen? What makes it happen? Both software were updated together with my PowerBook update, but, how come it doesn't happen to my iPhoto and iTunes library in my PowerBook? Most important of all, can you please recommend what is the best, the least time-consuming, and the most painless way to fix this and bring it back to the way it should be?