samba - Jan 2003 - - adding domain users to local windows 2000 groups

Hello,
   
I am having a problem with adding domain users to a local windows 2000 
group like Power Users.  It keeps giving me the error "unable to lookup 
user names for display."

We have RH 7.1 running and Samba 2.2.4 installed as a PDC.  I used to be 
able to login as an administrator of the domain in 2K and add as many 
users as I wanted to a group.  Now I have to actually have the person I 
want to add login to the computer before I can add them.  I'm just 
wondering if anyone else has experienced this before or seen that error 
and could help.  If anyone can help I'd appreciate it.

Thanks,
Matt Lung