I figured it out. The opacity is set at a very low setting so I could not see the image until I slid. Everything has been pretty intuitive for the most part but it would make more sense for the image to display immediately as to not create noob confusion. Anyhow...love this thing!
Hmmm... I'll check this again, but this is something that I believe was fixed around Version 1.17 or so - are you using the most updated version of the app?
In any case, thank you for the heads up, and glad you figured it out!