Audio from Pandora, Stitcher, Video, etc. will not play through my auxiliary port, whether I'm using headphones or an auxiliary cable connected to my car stereo. System sounds, rings, phone conversations all play through the aux port. Pandora, Stitcher, video, etc. play over the speaker.

This is not a hardware problem. I have also run the Pre's interactive tests, and it tells me my hardware is all working. In any case I CAN hear system sounds over my aux port

Anyone have any ideas how to fix this?

Thank you.