My 1st generation shuffle is not showing up in the USB port of my MacBook Pro. I wondered if it might have something to do with having recently run the latest iTunes upgrade, but the computer isn't seeing the shuffle at all, in either of my USB sockets, so I'm guessing it's not an iTunes issue. I've tried it in other machines and it doesn't show up there, either. It still plays (for the time being), but I can't charge it or edit the contents. Is it dying? Thanks.