I now know that to keep Entune working, you MUST AVOID the USB cable connection. Entune does work on iPhone iOS 5.1.1 with the Premium HDD only if you do not plug in USB. If you do that, you get better iPod functionality. But on the next use (e.g., park, shop, then return and try to re-connect), chances are it will fail completely. When this does happen, you will probably get a message on the head unit saying that there must be an application running… Don't give up, you can clear up the problem by performing a soft reset of your iPhone (hold down the “home menu” button and the “power” button for about 10-15 seconds. Agreed this is not nice, but it's better than what I went through for a week before I knew the trick to success. Additionally, I'm finding that Entune does not have to be in the foreground on the phone for successful operation. I first start Entune on the phone, then start the car. Info->Apps then works fine. I can park, use other apps on the phone, return and restart the car without bringing Entune back to the foreground, and everything still works. Just stay clear of USB connections.