When I tried checking our forums this morning, I got an error. Refreshing doesn't seem to help. I've called customer support for the web hosting provider. Apparently they've been doing some MSQL upgrades and while the tech guy wasn't sure if that's exactly what's happened to our forums, it seems like the most likely reason.
So basically my ticket has been escaladed but it's hard to say when the issue will be fixed. Hopefully they'll be back up soon.