Ever since the Apple TV update and the newest iTunes, I no longer can use the remote app on the iPhone, I cannot AirPlay on the 4S, and Apple TV home sharing doesn't work. No matter what I do, and I've done it all, it's not working. I've verified the account settings, restarted and reset all my devices, and checked my home network. I even uninstalled and reinstalled iTunes on my PC, and double check my firewall (Norton). Help!!