When I connect my iPhone 4 to iTunes I get this message "iTunes could not back up the iphone because a session could not be started with the iPhone". This happens on multiple computers. I've tried uninstalling and reinstalling iTunes. I've done a restore on the iPhone 4. My 3gs backs up with no problem. I have an appointment with the Genius Bar on Monday, but was wondering if anyone has ideas to try and solve this before I go in. Thanks for any suggestions. Edit-It syncs just fine. It's only the back up that doesn't work.