Hi, I'm attempting to backup my JB iP4 on 4.0.1. Lately iTunes stops half way through the sync process and tells me that my apps cannot be transferred because they are not authorized on this computer. I have authorized the computer (a few times) and it still says that. When the sync stops to give me this message it completely stops the whole process and none of my songs are synced etc. Any clues on what I might try to get everything backed up to I can update to the 4.2.1 JB? Thanks!!