I think there may be an issue with forum passwords which are 6 characters long as I am getting stuck at the registration stage. Is the same password used for both the account and posting on the forum?
I'm not certain, though my inclination is "probably not" as there's no forum integration AFAIK. On the contrary, I would recommend
not using the same password as the forum as the forums are not currently as secure as we would like (we are working on an https update right now, but at present connections are not encrypted).