Maybe I'm not interpreting what you posted correctly, but it sounds like what you are doing is similar to how I read the forum. Click on a sections, read the messages that interest you, then back out and go on to the next section. However, I never use back to get all the way out, I click in the nav tree just above the messages, because as long as I've been here, no matter what browser I use, if I just use the back button, it still shows flags the section as having new posts. If I actually use the tree to select the top level, or even the high level category, then the section I just was in will show as having no new messages (unless someone actually snuck in and posted). That happens for me with Chrome, IE, Edge, or Safari. Sometimes I forget and use the back button (easy when there's a back button right on the mouse) but in that case I can either revisit the section and go back via the tree or refresh the page. This does not appear to have changed with HTTPS.