I've had frequent problems getting to this board using Firefox on a Windows 7 PC. I'll often get "bad gateway" error messages superimposed on a white screen. Switching to Internet Explorer, I'll get in without any problem. Oddly, while I've sometimes overcome the issue by clearing the cache, quitting and restarting Firefox, more often than not, the problem just goes away spontaneously.

Firefox on my mac doesn't seem to have the same level of difficulty, though it has hung up as well with the same puzzling error message.

He's faster than a bullet, stronger than a train
He's the one who got lucky, got his cape around miss Lois Lane
I can't believe my dilemma is real
I'm competing with the Man of Steel

- "Jimmy Olsen's Blues" by the Spin Doctors