Istone Translator App problem

[Pat New Iphone4s Use]

Hello, I just installed the Istone app free and then German in app purchase. It keeps bouncing me out if I try to scroll down once within the translator choices. I have deleted and reinstalled, and have also restarted my phone. The app says it is for version 5.0 or later, and I have 6.1, so I am unsure what else I can do. The original app was free, but the German was not, and it would be a nice app if I could get it to stop bouncing me out. Any suggestions?