I am the owner of the group, just created it. I checked, made sure the group is published, Ran the tools. Still no luck. I hope that future releases are less buggy.
Looking forward to the update.
I found the problem, for some reason it did not publish the Category in the forum when the group was created.
However, there is still a problem which I hope is fixed. The group is Invite only and is open to USERs only but still shows up on the list of Categories. It should not show up at all with that setting. I hope this is fixed in 2.5. The group is supposed to be private so other users should not see it in the forum list.