i upgraded to Yosemite. when i tried to access iPhoto it automatically switched to photo and said it was importing my library. fine! no problem! except it stopped at 11% and won't continue. i left it running for TWO DAYS and it stayed at 11%. now i can't access my photos at all because if flips to photo and photo won't complete the import.
iPhoto '11, OS X Yosemite (10.10.4)