OK. I was syncing my iphone and when I came back to check on it all was good BUt it did not update and sync. I checked my iMac and it was not letting me do anything and it had closed iTunes ? I tried clicking on the Apple in the top left corner to restart or even switch users and it would not let me. It kept reloading my home page ! I had to force it off with the power button and after serveral attempts including leaving it unplugged overnight, it still wont work. If when i restart it I log in as another user though it works just fine .... but my User will not work correctly. I cant even open a pic as it gives me an error and shows a blankspot where the pic should be.... ANY HELP !!!!!!!!! never ever had any issues EVER on a Mac and I am stumped. I shot a quick video on my phone and uploaded it so you can see what I mean. http://www.youtube.com/watch?v=KsYEPNQktcA .