[CentOS] Samba GUI interface

CentOS 5.1 I was just trying to add users and shares to Samba from GUI interface. I've already added users from command line. Regardless, when I go to select users the existing users is blank. When I add a user if it already exists I get a complaint that user exists. If I add a new user from GUI it does not get added to the blank list. OK I just added a user from gui, applied it [HIT OK] went back and tried to add user again but when hitting [OK] complained that user exists. Seems things are working except listing existing users in interface. I can live with this but I'm about to upgrade a server at work and ultimately I was hoping my Windows Sys Admin could manage to administrate Samba. I don't think this will be possible without a GUI.