Whenever I try and copy music to my iPhone via iTunes I get the red "Ghostbusters" sign. I had to re-install my iPhone 4 with 4.3.3 last night (as per on here) I upgraded to 4.3.5 to try and cure this problem. It used to sync ok but then stopped, hence why I tried the upgrade. My iPhone currently has no music on it after the re-install yesterday and its annoying lol. Cheers!