Further to that . . .
I use the New Posts menu item when I visit ... I click on one on the list, go read it, reply if I want, then click on New Posts again to go back to find a new one ... but if I'm on the site too long, eventually I'll click on New Posts and it will say there are no new ones, even though I know there a bunch I haven't read. I use back on my browser, but obviously there is a timing issue there?? What do I know????