also our max filesize seems to be at 7MB, so that probably wasn't the problem. Something else is going on, but damned if I know what it is. Maybe it's a good time to update MediaWiki.
As far as uploading goes -- I just rebooted the server. Can you try again? I won't be able to test anything this evening as I'm going out the door to see Billy Bragg at the Aladdin Theater with my kid, courtesy Siobhan from People's Budget Project, who gave us the tix to this sold out show.