Look to your right... the grey category bar... see the words "Unread Posts?" Click on those words, and you will be directed to any topics you haven't read (in that category), since your last visit. If there is none... you have the option to click again, and read ANY unread topics.
-----> "No unread topics found since your last visit. Click here to try all unread topics."
It is a new feature. I'm hoping it works better than the options, at the very top of the forum... cuz they suck. I miss stuff all the time. Of course it doesn't help, if I read something offline, and haven't cleared my cookies. The cookies know what I have read. lol