system-config-users and usermod on F18

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http://forums.fedoraforum.org – hi, on F18 LXDE the system-config-users does not allow to add users in GUI -- "The group <...> already exists" started s-c-u as root ? is this a bug or a feature? alternatively I used 'usermod -G<groupname> <username>' here usermod lets me add a user to a group, but adding the same user to a different group too, the user is removed from the first one (users own group is OK) ? what is happening here? ? how can I add an existing user to several groups? TIA, meine (HowTos)