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Basically when the Jon group button is depressed the page does not refresh to show the invite friends button.
So the user does join the group, but they have to refresh the page manually to cause the change in state of the button. Which if you don't know to do that, you are left not knowing if you have successfully joined or not.
I reported this bug about 4-5 months ago and it seems it still has not been fixed in any update.
So I'm glad someone has found a temporary solution. The code was provided on the above page to resolve this issue, but I have no idea what file this code must be inserted.
I found which pluigns made this problem... if you disable "kunena - groups" plugins, your jomsocial group will be fine.. For a week i tried how can i still enabled this component and make your group working fine.. but i think this is about kunena or your template..
I see that plugin is now disabled and join groups button now works fine.
This is very interesting because we were aware that the plugin was not working anymore,
and had some custom work done to create a plugin that create forums for Jomsocial groups. This custom plugin still works, so disabling the old kunena plugin is no skin off our nose. Plus we have the join group button working, which is great!
many thanks David for all your hard work and research