The app is very nicely done, however, running iOS 5.1.1 and using the app to open a photo from the camera roll can lure you into a trap. The problems start when you open a photo and choose to add effects to it, the first thing that happens is that all the effect thumbnails are blank (you only see the effect name). If you choose an effect then the screen (for me) goes completely blank. The UI elements are simply gone and you cannot exit this mode. The only solution was to delete the app and reinstall it, again (then again). Im avoiding using this app to open the camera roll at the moment.
Hackcess about Camera Genius, v4.4