For a few weeks now I've been noticing that every time I try to sign in to the forum (from a computer that I don't leave my username logged into permanently) it comes up with the same error every time.
If I enter my username and password and hit the login button it returns me to the login page and the second time I enter the username and password it accepts it and signs me in as normal.
I don't know if anyone else has noticed this but I thought you might appreciate a heads up.