Is this a known bug? I haven't seen it reported. On my iPhone 3GS I used to plug my car adapter and play audio through an app through the car speakers. Mostly, I try to use the MLB app. Obviously, the device wouldn't charge and I would get the "Use airplane mode" message, but otherwise, it always worked. Now, my iPhone 4 will play iTunes audio no problem but when I load an app there is absolutely no audio. This happens in all my apps: MLB, Pandora, Audible, etc. But again, iTunes music through the regular player work fine. Any tips?