This just came in from Matt as a possible harp fix using the iPhone 4S:
“Plug your phone in to your computer and open your iTunes account. Wait for your updates to finish and then open the tapped out app on your phone. Mine worked right away. It took a few tries for my buddy but it worked for him too.”
So this may be in addition to the iPhone 5 fix (leave the autolock off, log in, and let the harp play out for 15-20 minutes.
If you have a 4S, give it a try and let us know here if it works for you. It’s certainly worth a try.