Since the new library worked your old library is damaged. If that fails to fix the problem post back for one last fix scenario. To make it permanently visible enter the following in the Terminal application window: chflags nohidden ~/Library and hit the Enter button - 10.7: Un-hide the User Library folder. NOTE 2: In Lion and Mountain Lion the Library folder is now invisible. You'll also have to reset the iPhoto's various preferences. NOTE 1: If you're moved your library from its default location in your Home/Pictures folder you will have to point iPhoto to its new location when you next open iPhoto by holding down the Option key when launching iPhoto. Lion from the User/Library/Containers//Дata/Library/Caches/ folder User/Home/Library/Caches/ folder ( Snow Leopard and Earlier). To narrow it down further go back to your account and Try the following:ДЎ - delete the iPhoto preference file,, that resides in yourДў - delete iPhoto's cache file, Cache.db, that is located in your Switching account help determine that the problem was system wide and could be either a problem with your original account or some preference files.

Iphoto library manager rebuild