#1 - Jan. 25, 2013, 9:31 p.m.
I can’t log into the gw2 forums with Firefox, even after turning off adblock and noscript. Not sure why, but it has never worked. Win7-64, if that helps. I have to use IE. 
I can’t log into the gw2 forums with Firefox, even after turning off adblock and noscript. Not sure why, but it has never worked. Win7-64, if that helps. I have to use IE. 
Have you tried going to account.guildwars2.com & making sure you’re logged-out there? Sometimes the forums/account site get into a fight over whether or not a session is valid & fun things happen.
Does logging into account.guildwars2.com work? The forums login isn’t doing anything special. Does Chrome work?
Might be worth clearing your cache & giving it another go?