Now that we've been up and running for a few months a lot of topics are starting to drop off the default view, which is 3 months. For example when I look at the forum list I see (at this time) that there are 8 threads (topics) in this Tips and Tricks section, but when I open it I see only 3.

To see the rest, go down to the Display Options below the topic list, and change the "Active in the last 3 months" to "from all dates" and click change.