First off, I have contacted GM, and they are scratching their heads on this one, so my thoughts are that maybe one of the recent updates has effected some of the functionality. The whole story is that the wife got a new Yukon, with the Rear Seat Entertainment package. It connects through a USB cable that then uses the nav unit to pass the content onto the screens. She bought the Yukon back in April, and on our trip to Gatlinburg, the phone showed up as an option on the video source selection. Now it doesn't. I am attempting to do this with a 4s, with 5.1.1, and a ipad also on 5.1.1. While connected, and in videos, the phone/ipad displays the white screen of connectedness. Whereas before, you had full functionality to choose the film, and control play/pause. Anybody have any ideas?