UBB.threads PHP Forum Software Community Forums UBB.threads 6 Version 6 Support Last post is all that appears

In my new forum (v6.4.2) located at http://forum.riverfolkfestival.org/ubbthreads.php?Cat=

When visitors & users click on the link in the "last post" box they go to the last post as anticipated. Previous threads/posts are above (flat mode) and can be viewed by scrolling up. Tis good!

When registered users of a private form (post can't be seen unless member of the group) click on the link in the "last post" box they go to the last post, but none of the previous threads/post are visible until clicking on the "Index" link.

Is this the way it is intended to function?

Thanks

Disregard this!

The problem was a new user created a new thread as a reply to a previous post. Sorry for the trouble and the slow learning curve.