I can't get either my new iPad or my iPhone 4 to recognise Airfoil as an output option after the in-app purchase. I have tried running the Music app on mymiPad and the Airfoil Touch app on mymiPhone and visa versa with no success. Any ideas why anybody?

I was so excited when I saw this update and the inappropriate purchase, now I just really want to be able to use it :-(

Any help would be greatly appreciated.