"iPhoto has detected inconsistencies in your library. "
When I insert my camera's SD card into my Mac, iPhoto launches and then I get a warning message, "iPhoto has detected inconsistencies in your library. Please click Repair to avoid any potential problems." I click Repair and it performs a lengthy operation. When done, no photos are imported. Instead, I get another window that says, "Unreadable Files: 285. The following file could not be imported. The file is an unrecognized format." It goes on to list several hundred NEF images. This happens over and over when I eject the SD card and try again.
I've been able to import photos with no problem for years now, so I don't know why it would not recognize this file type all of a sudden.
What do I do now?
3GHz Mac Pro, Mac OS X (10.6.8), 12GB RAM