Well, it remembered me untill today. I had to change my email
address in the new area - had to log in there even though I was
already logged into the forums. After the address change I had to
re-log back into the forums. Now, whenever the computor is
rebooted, I need to log into the forums.

Re-booting isn't scientific !!! Only what I've noticed.

edit : And closing the browser and reopening it can cause the
forgetfullness also.