kdm in Kde3.1.3

[Philippe Merlin]

Hi,
I just installed Kde 3.1.3 and i have an little difficulty to configure Kdm, 
actually the screen reserve a field too short for the name of the users, so 
there names are troncated .
In Kde 3.1.0 there was no problem How i can configure kdm ?
Thanks for help me.
Philou75