I want to process a picture in iPhoto11 (MBP, OS 10.8.3) with PS Elements 11: In iPhoto/Preferences/advanced I have chosen Adobe Photoshop Elements 11. When I try to process a picture in iPhoto the program PS Elements starts correctly, but the picture does not open.
Most likely you chose the logical file instead of the hidden correct file. The one at the top level of the PSE 11 folder in applications is the welcome screen. You want the actual editor, which is hidden in the support files folder: