It seems to be working now.
I first uninstalled the plugin and reinstalled and had no joy at that point.
So I when ahead and removed all the members I had, deleted all the groups, then I unistalled the plugin. Then I further deleted the two pages that I was setting up the separate groups on. Then I reinstalled the plugin, added a member and created the group through the member. Then I re-created the page where the list was going to go, and added the short code.
Now it seems to work fine. No idea what is going on, but glad it seems to be ok now. Just wanted to document my whole process to see if that helps in your debugging.
Kudos on the great plugin. Very helpful.
