My internet options are already set as such, have been since as far back as I can remember.
I just noticed something...I clicked on a link in one of the threads here just a few minutes ago, and when I closed out the tab from the link and backed out of the thread I was viewing, it showed up as read, like it used to do. No luck afterwards, though, still not showing threads as read unless I manually refresh.
When you mentioned security settings...are you referring to those on the site? (assuming it has something to do with the recent hacker attempt?)
Eric