I've been having issues logging in for the past two days. I don't have the exact error message saved, but it was an Apache error (Error 413) related to "Request Entity Too Long." When it does this I can't login at all, I can only view the forums.
Don't think i ever faced an issue like that. I did have to accept a lot of incomplete security certificates when i was using Opera 9.64 browser, but that didnt happen with 9.63. But im sure it's completely unrelated to your issue.
I am an ex-HP Employee. Currently inactive on the forum.