Of course it relies on me remembering to log off
I'm not with you, Jeanne. If you never log off then doesn't that mean you never start a new session? The sessions never seem to expire for me without logging off. Still, the time displayed is not much help (well, unless I subtract 7 ).
As I said, I also get the yellow markers on some threads that I viewed in full in my previous session. I dunno if the login somehow takes my local time and uses that or what...
Some of the threads are the ones that I've replied to myself in my previous session, not new threads.
So the last update of the thread occurred after your last login. (obviously since you were the one doing the posting)