After upgrading to GJ2 a couple of days ago, my "regular" users no longer see their group forums in the Kunena index view. As the site moderator, I still see them listed there. They DO see posts from GJ groups within the "recent posts" view.
Here is a screenshot, side-by-side, with the admin view on the left (seeing the GJ group forums), and a user view on the right, where those forums are not visible. (the user view is a member of one GJ group)