Can you please move the sub-forum "General Discussion" one hierarchy higher, e.g. out of the "Chat"-hierarchy? While viewing the list of sub-forums, the icon on the left is orange when there is at least one unread thread in that sub-forum or sub-forum hierarchy. Since "Chat" also contains "Forum Games", it as (at least currently) almost permanently lit, so there is no chance of seeing additions to the more interesting "General Discussion" from the top view. Activating "Mark Forums Read" at the top view is a game of luck now concerning this sub-forum.
