This iTunes update is HORRIBLE. I haven't updated my iPod in the longest because I can't even stand to look at the thing. I REALLY hope someone changes this. It's so complicated for no reason.
Got a backup?
One thing that might help, is to return the sidebar, if you haven't done this already.
You can do that by clicking View >> Show Sidebar.
Ahhhh! You are amazing!
Retrieving data ...