IPhoto has stopped working
After installing Yosemite IOS X, my iPhoto library has stopped working, after two weeks. The message in the box says: "Your photo library is either in use by another application or has become unreadable". Then it says "shut down and restart your computer and then open iPhoto again. If the problem persists, try rebuilding your photo library. To do this, quit iPhoto, and then reopen it while keeping the Option and Command keys is pressed. You can also try restoring your photo library from a back up. I have tried the first two options with no success. I have not tried restoring the photo library from a back up yet. I would like to see if I can fix this before taking that route.
MacBook Pro, OS X Yosemite (10.10)