I have used groups in the past without any issues.
I've created some new groups and have assigned people to them through "Edit Person", "Groups" and checking off the correct box.
However, when I go back in and pull up the "Groups" the Group is showing in the list, but there are no people in the list.
Groups I've created from years ago are still working correctly and I can still add to those older groups.
Currently I have 22 groups.
Any help is appreciated.