Chris and Sarge, just a few more details on my symptoms:
I always check the box to stay logged in after the session ends, and when I start a new session, I am logged in. Every time, no exceptions unless I clear out the cookies. This happens both at work and at home.
I can poke around the BBB for a while, and I admit that I don't always notice when I get told that I'm not logged in and that I need to log in or register. Of course, it becomes clear when I try to post a message like this one. I have, on occasion, posted a message, gone to another thread, and attempted to post a message, only to be told I'm not logged in. This happens both at work and at home.
Similarities between the systems - both are running XP Pro SP1, MSIE 6.
And it happened again this morning.
--I know what I like--