If one user on the system has a Real name containing XML markup like & or <, the users list behaves badly. Sometimes you get twice the same user name.

This seems to be because the string isn't escaped when it's passed to the GtkCellRendererText. /var/log/gdm/:0-greeter.log contains many errors like:
> gdm-simple-greeter[1189]: Gtk-WARNING: Failed to set text from markup
> due to error parsing markup: Error on line 1, character 18 :
> « Test&2< » isn't a valid name: « & » 

Real names can contain almost any char, so better escape the string with g_markup_printf_escaped() or g_markup_escape_text (). That's what I'm now doing in users-admin.


(This is gdm 2.30.2 in Ubuntu 10.04.)