This may tend to confuse, i find occasionally I have to log in again. Due to a timeout I suppose.
But the login complains that It is an unknown user name or password, or something similar. numerous retries with my uname/password .
Same result, then if I toggle down to the bottom of the page, select the link for the forum, lo and behold the forum immediately comes up ok and I find that I am already logged in.
I am also using Firefox.