Seems totally nonfunctional w/ Android 4.2

Please make sure you don't have any virus protection apps running such as Avast.  The app does work on JB.

No A/V or security app is present on the device at all. It's less than two weeks old and running the stock  version of Android 4.1.1 (not 4.2; sorry). Also, it's working fine today on 4G only, so I guess I need to check if my home gateway is blocking the connections for some reason via WiFi. Any unusual ports/protocols the app uses?

Hey Robert, sorry for the delayed response... The radio streams generally use HTTP protocol connected via port 80.  There must be something blocking these stream in your home network.  Are you still having issues?

Thanks the problem was definitely my Motorola SBG6580 "home gateway" which apparently has buggy firewall functionality, so I need to replace it. App works great, and sorry for jumping to conclusions.

Thanks for letting me know!