Before if you never read a post it would show it as not read for a while (until you went inactive or logged off).

Well now I have changed it that if you don't read a post it will always show unread unless you either read it or mark forums as read

So this is actually better if you like to read every post and don't want to miss any.

It also uses some extra database resources, but shouldn't really effect the forum speed.

Anyway, had people screaming because they had old posts showing in the New Post section, but if you want to remove all posts so they show as read, then just mark forums as read