I had set up my iPhoto library to link to my external hardrive. It was working great, but all of the sudden when I try to open iPhoto it gets stuck saying "Loading photos...". I have tried opening it while holding the option key and resetting the library location, but when I click the iPhoto Library folder on the hardrive (same location it always is) the open button won't work. It's blue and flickers when I click it, but nothing happens...any ideas?