Bright and dull envolopes

I wondering why is it when you view a thread and exit the browser and go back to it, the it says that there is a new reply, even thiugh there isn't. I'm just wondering why. I know if you log you, then log out, there will be no new messages.

it just doesn't work here for some reason... well, not always

It's a known problem.

I havnt noticed it..