Usually after I read new threads in the OoT, I hit refresh so the "yellow" threads go away. But since earlier today, they don't go away at all, the yellow icons stay there.
On a similar note, the FFXIV forums don't show any "yellow" threads and the "=" icons for new replies don't disappear either. I had mentioned this quite a while ago too.
I'm using Firefox and FFXI skin, if it matters.