As I don't have any new photos I just quit iPhoto and dragged the bad library to the desktop, the old library to the pictures folder and I could launch iPhoto. I think it is the same bad folder that opens. Do I have to leave this bad library on the desktop? The iPhoto Library in the Pictures Folder is of size 22.62 GB and Kind - package and when I clicked on it a Terminal window opened. I didn't enter any command in terminal. Maybe I should leave things as they are, now that I can at least open the bad library.