I was getting regular "service unavailable" errors on the forum and the website a couple days ago, and some of the graphics haven't displayed properly for weeks now.
Old theme?
Yes
Switch to the new, no issues there.
I think they've stopped supporting the old theme.
The new theme is ugly. I'll stick with my old grey background until I can no longer do it. After that, I'll no longer use the forums. White backgrounds burn my eyes.