'm trying to switch from GDM to KDM. It works but there is a problem. Whenever I switch to a KDM theme that I installed it doesn't work. There's a blue screen which says : 'Theme not usable with authentication method 'Winbind / Samba'

Then I click and it goes to the theme. I just can't see what I type. And there is a little box in the top-left corner that says: Password:

It's only with this one theme I installed. How do I fix this?

Oh and I'm a beginner so try and spell things out for me.

I'm running SLED 10 SP1.
I have KDE 3.5.