I don't believe the cookie gets refreshed everytime you load a page from the server. It may be on a timer - refresh each day, or based some other fixed duration. If there was a log-on or log-off function, they could sync the cookies to that, but the board doesn't work that way.

Perhaps JC can query the UBB folks to find out how its supposed to work. Also could be a bug.

Rgds,
__
/im