With respect to all of you who have been able to create synths, there is still something about this software that doesn't work. I've loaded my photos into the app and pressed "Synth". It does whatever it does and the progress bar gets about 90% to the end and stops. It says how synthy the collection is, and the "Create New Synth" button is active, the "Pause" button is inactive. For all I can tell, the application is "done", except for the part where I have a completed synth. So, in that respect, the software does not work.
There are no error messages, hiccups or other indications that the application is unhappy. It just doesn't do anything.