Well I was at 98% and got this message when I hit next:
Upgrade in Progress
We are currently in the process of performing routine maintenance.
We should be finished very shortly. Thanks for your patience!
I hit the back button and I've still got the page there. I hope they've fixed the problem so I can hit submit again by the time I have to leave in 20 minutes, because that took a decent amount of time to finish. whew!