I worked with iPhoto for a while, tagging photos with faces. Now when I view my own faces, I see "Steven Fisher may be in 8 additional photos."
I click Confirm Additional Faces, then click to confirm each additional face. I click Done. There's no error message, but I still see "Steven Fisher may be in 8 additional photos." And when I click Confirm Additional Faces, I see the same eight photos.
I can repeat this over and over again. I've recursively changed the permissions on the photo library to 777, changed the owner, rebuilt the library (letting iPhoto change the permissions), but nothing's helped. I once fixed this by completely deleting the library, re-adding all the photos to it, but it died again within a few weeks (and, of course, I lost a ton of metadata I'll never get back). What else could be wrong?