I think we are much closer now. After installing the new gj release we still have two "Group Forum" links that appear on the Group Activities page (not a deal-breaker) and the forum does appear when the Group Forum links are clicked. However, the forum is apparently created in an unpublished state and so I get the error: "You do not have access to this forum!" when clicking on the "Group Forum".
If I publish the forum on the back-end Kunena Forum Administration area, then I get the normal forum screen and can post.
I checked through the Kunena settings and didn't see anything obvious that would automatically publish the new group forums. Is there a Kunena or other setting that will automatically cause the forums to be created in a published state?