I'm having the same problem with my 2010 Terrain with the pioneer radio. The phone is an iPhone 4s with ios 5. On mine, I see the ..indexing.. For a minute or two then it works as normal.
I also have a problem were the alert sounds, new email or txt, don't play over the music. The volume of the music drops for a second where the alert should play but it doesn't. Voice directions on my tomtom app work fine. And yes, the mute switch is off.
Anyone else have these issues? I have an appointment with the dealer to check some other issues next week. I'll see if they can update the radio.
so what ever happened after the dealer visit?