Are you using the active topics area? If so look in the upper left hand area and change the drop down menu to something other than last visit. If on you last visit you didn't look at everything and nothing was posted in a topic since your last visit, it will not be "active" anymore. You can set it for a to look back by a few minutes, a few hours or more. Of course when in doubt you can always click on the forums button and manually go throught all the forums and you will see all threads whether currently active or not. I hope that makes sense.