If I double-click on a single photo it opens up in showFoto, but if I want to check out the next photo in that directory clicking the forward button does nothing. If I highlight all the photos in that directory and right click on one and open with showFoto from the context menu, then I can cycle through fine with the back, forward, first & last buttons. The functions of the buttons work but only under a certain condition. Any other viewer I have used these functions work when only one photo has been open by the app. It's counter productive to have to open all of them imho.