Cookies?

[Blue_Heron]

I've been experiencing a weird problem with the forum for a while now. Normally, the forums with new posts are displayed in a different color and the threads with new posts are displayed in bold. But quite often lately, it all clears as though I've looked at everything and I can't tell which posts/threads I've looked at. I've stumbled across threads that were a week old that displayed as if I'd looked at them, but I hadn't even seen them yet.

Is this happening to anyone else, or is it me? I'm using Firefox, but I'm not experiencing any other issues I'm aware of.

Dave