I did some stuff over the weekend that may have logged some people out of the forums. There were also some problems with the message marking feature. I think this is happening to people, like me, who have been logged in since the forum was upgraded to the current version.

So first thing is to check and make sure you are still logged in.
Then:
click on user menu from the main b-n-t forum
then click on edit your preference
Make sure "Use MARK timestamp feature" is set to yes
Also make sure "Automatically log in when you return" is set to yes
If they are and it's still not working, try logging out, closing your browser, then bringing it back up and logging back in.