Even though I've read them? Are you guys having that? I leave this page and come back and threads that weren't highlighted because I'd already read them, are suddenly bold again even though nothing new was added.
I think if you just "arrow back" the thread will remain showing as "unread".
If you read the thread, go to the bottom and click on the "O&E" or whatever forum you are in the thread will show up as "read". Works that way for me, anyhow.