Hi Vblue42
Thanks for your continued support with this. I've tried what you suggested, even resetting the phone. I've uninstalled AppRadio, and AppRadio extensions from Cydia, then rebooted and reset, then re-installed both, then reboot again. I've also re-installed the likes of Angry Birds after all that to see if they work. I have discovered that when linked to the head unit, I am getting sound from the apps (I tried Angry Birds and I get sound but just a blank screen, although the sound will even come over the top of any mp3s currently playing.) I've even changed TV out in settings