It has to do with the cookie settings on the forum software.
The easiest way around it is to bookmark
http://forum.calgarypuck.com and come at the forum that way; it will then remember your password. If you come to the forum from
www.calgarypuck.com/forum then the login issue happens.
The forum software has the cookie settings incorrect but I don't want to fix it because that could cause a large # of people with login issues. It will get fixed when we upgrade the forum software soon.