I got in touch with iHeart about this and the app is not yet compatible with 2.3.3 or higher. I've received no word yet on when an update will be available. I'm not happy about this either.
Tunein is pretty good too but they do not cover all stations like iHeart does. My local (Orlando, FL) talk radio station is not available. Surprising since it's quite a large market. I would definitely download that for now and see if they have the stations you want.