I've photos in the iPhoto library. But, my Apple iPhoto app stopped displaying my pictures a some time ago. How do I fix this problem?
Before you fix this issue as mentioned below make sure you've backup of the iPhoto library i.e. "~/Pictures/iPhoto Library"folder to pen drive or other backup medium.
First, close iPhoto.
Now press and hold down the command-alt-shift keys and restart iPhoto.
The above action will force to rebuild the library. It may take some time if you've tons of photos in the library.
Finally, you should have the old and a new library folder.
Close iPhoto app.
Do not delete anything and simple rename older one as it. Finally, restart iPhoto.