Console output:
Gtk-ERROR **: GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported aborting...
This was reported in the wrong project, and has been moved.
I am affected too.
strace users-admin is attached
I can confirm this issue. Does it work to access the users panel within the main system settings program? This works for me.
As for a cause, it looks like the dev didn't finish the transition to GTK3, and left it in the middle.
" gnome-control-center user-accounts" seem to be working. But it can not be used to change group membership. In addition to that, i am not able to remove users using "gnome-control-panel user-accounts". This may be different bug.
Bug watches keep track of this bug in other bug trackers.
This was reported in the wrong project, and has been moved.