ooblies

I purchased my 2009 Audi A4 Cabriolet used about 6 months ago. I've got the version with navigation in it as well.

I also have the iPod connector in the glove box instead of the CD changer, and my iPhone used to be able to work perfectly through it. It even played Pandora and Spotify (which I didn't expect to work).

A few weeks ago however, it stopped working. When I plug it in, I still get the "This device is not supported and won't change" message, but nothing happens CD screen of the Audi (when nothing is plugged in it says CD 7, then switches to CD 6 when you plug in the iPhone/iPod). Spotify and Pandora won't work, but neither will the iPod app on the phone.

The weird thing is that my iPod still works fine, my friends iPhone works in my car, and my iPhone works in his car.

I can't even find anything like this having happened to anybody else, much less suggestions of how to fix it.

Thoughts?