Something is messed up
UPDATE:
Found an answer to the issues detailed below. There was an empty folder with a bunch of numbers and letters for a name lurking in the Auto Import folder inside the iPhoto Library package in my Photos folder. Removing this empty folder solved all my (iPhoto-related) problems.
ORIGINAL POST:
Not the same, but perhaps a related problem.
OS X 10.8.4
iPhoto 9.4.3
If I have iPhoto active in full screen mode and switch away from it then back, it exits full screen and goes into 'importing photos' mode - but there are no photos to import. I have to force quit to make the 'phantom' import stop. This happens regardless of whether or not I imported any actual photos during a session.
If iPhoto is in standard window mode, switching the focus away from it and back to it makes the 'importing photos' window appear for a split second, then the view changes immediately to 'Last Import'.
This is something of an irritant, as you may imagine.
Did you ever fix your problem?