OK look, this is the situation. I recently downloaded iPod 3.0 software and ever since, whenever I try to sync apps from iTunes... they won't. I can only download them from the App Store on the iPod. When there's an update on the iPod for an app I bought on iTunes, it installs then disappears. I click "Sync" and all the apps sync, but nothing is there. It says "This computer is not authorized to install ... blah blah" I've tried the Authorize button but still nothing. PLS HELP.