Hi, I am pretty sure I found others with this problem before. But now when I am searching I cant find anything. I have a brand new i5 imac. I have rebuilt the library, fixed permissions, exported to aperature, reinstalled the latest iPhoto and osx updates. All with the same result of some of my pictures only showing thumbnails. As soon as I double click them the screen goes black. Strange thing though if I am faces mode it pops the face recognition box where a face might be? Any help is appreciated.