Upgrade broke app on iPhone 4 with iOS 7

I delayed upgrading to the next version of Thumb Jam for fear of breaking the app, and when I finally did thats just what happened. The icon is greyed out and displays "waiting..." And yet, I can open the app, but ONLY by going on the App Store and clicking the "open" button. All my creations are still there, too. Weird, huh?

foxdoc2001 about ThumbJam