Can't log into #! Forums under Waldorf

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http://crunchbang.org – I'm running 64 bit Waldorf on an AMD64 machine.When visiting the crunchbang.org/forums page with Iceweasel I can click on "login" and enter my username and password, then click the login button. I get the message "you have succesfully logged in . . . " but then I get flipped back to the original forum page where it says "you are not logged in". I have tried the same with Chromium with the same result.I can log in to other forums (e.g. Mint) without any problems.I also run 32bit PAE Waldorf on my little EeePC701 netbook. The same problem occurs when I wait to (HowTos)