Every time I visit this site I have to rewrite my username and password...grrr.

Yep, same happens for me every time. Pretty annoying.. Do you hear me Tal, pretty annoying!! ;)

it's a shame i didn't choose 'store in cookies for a year' when i registered...oops

You still can... click on the preferences link above...

Problem is I did choose that option, and it still doesn't work :(

http://www.sorcerers.net/cgi-bin/ubbmisc.cgi?action=setprefs

After resetting that, it's impossible that it wouldn't work for you, unless you have cookies turned off in your browser or some sort of anti-cookie protection running in the background.

Check your Profile page too, and make sure you have that option enabled.