[arch-general] User list missing in gdm

Hello! Some weeks ago, the gdm user list disappeared. I have been trying everything that I have found, but no luck. If I reboot the computer several times, it finishes working, or if I issue a /etc/rc.d/gdm restart. But this is my wife's computer, and I would like it to work as it should... I have another six computers, and I don't know how many virtual machines, and this is happening also in a virtual machine. Any ideas? Best Regards Guillermo Leira