It's currently set to option # 3:
Quote:
This option controls how threads and forums are marked as read.- Inactivity/Cookie Based - once a user has been inactive for a certain amount of time (the value of the session timeout option) all threads and forums are considered read. Individual threads are marked as read within a session via cookies.
This option is how all versions of vBulletin before 3.5 functioned.
- Database (no automatic forum marking) - this option uses the database to store thread and forum read times. This allows accurate read markers to be kept indefinitely. However, in order for a forum to be marked read when all threads are read, the user must view the list of threads for that forum.
This option is more space and processor intensive than inactivity-based marking.
- Database (automatic forum marking) - this option is the same as a previous option, but forums are automatically marked as read when the last new thread is read.
This is the most usable option for end users, but most processor intensive.
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So the forum keeps track of everything whereas before it would mark everything as read after a specific time. It will still do that but that's set to 10 days now.
You can mark an entire forum as read by double clicking on the forum indicator (the red circle by the forum that is either red for unread items or greyed out for no unread items).