Topics do not appear in forum module
 

I just upgraded to beta 20, and the forum modules now have four tabs, Topics, Latest Activities, My Subscriptions, and Photos. I edited the module so that Topics is the first in the list and the default tab. When you click on a forum from the main page however, the Topics tab comes up empty and says "No topics found," even though I have 16 topics in the forum. You have to click on a different tab and then back to the topics tab before the topics appear. I am beginning a new forums site and I can't expect my new members to work this hard to find topics so they can participate in the conversations. They'll just leave the website all together. How do I fix this?