I have iPhoto version 9.2.1 and OS 10.7.2. Ever since upgrading to Lion, I cannot edit any photos anymore. I can see the thumbnails, but when I try to edit the photo there is just a blank black screen, even though the thumbnails are still visible at the bottom of the screen. I have my photo library on an additional drive installed in the main box. I have the MacPro. I have not fiddled at all with the photo library. I have tried to create a new library on the internal drive and imported photos into the new library, but I have the same problem. Any suggestions on how to fix this?