I have had a problem for the past week where a folder action created in Automator has stopped importing photos from a folder into iPhoto.
I have tried: Repairing disk permissions. Deleting the script from library/workflows/applications/folder actions, and then recreating it from Automator once more.
Neither of these worked, and some googling seems to indicate that many people on the Apple support communities have similar problems, so perhaps an update at some point has broken this functionality, and I was unable to fix it.
OSX 10.8.4 iPhoto 9.4.3 (720.91)