When I arrive at the Active Forums page it remembers the last day I visited and displays any active threads since then.
Before reading any of them I log in. After logging in, all reference to any active threads is erased and the current time and date are shown? I have to reset the counter to yesterday to display any new posts I have not read since then.
After replying to a post, I can not use the back button or it will bring me back to my un-submitted post. Another touch of the back button will erase my post.
So I scroll to the top of the page and hit Active Posts. You guessed it, the counter resets to the time I logged on and forces me to reset it again.