NTDOC@Benny
There is discussion on the board about it and at this time not sure which way it's going to go. Part of the reasoning for setting all as read once you read one from the forum is that on some boards there may be dozens of posts you don't want to read - in that case you don't want it showing you have unread posts - until an actual new one arrives.
In my case and probably yours we do read all posts so we would like it to keep the main forum indicator on until we have read all of them in cases where maybe we've had to close and come back later, etc...
I'll let you know if that does get changed. I've asked for maybe an option or button for the user to click to allow either operation so both sides of the fence can win.