samba - Aug 2005 - Error: "The local policy of this system does not permit you to logon interactively"

Hi all,

I have been having a bit of trouble setting up my Samba 3-OpenLDAP 
PDC...This is something totally new to me (no previous Samba experience 
at all).  I've had several speedbumps, but I've finally got my setup 
almost complete.  I can join computers to the domain, however, if I try 
to logon with a user, I get the above error from Windows.  I can logon 
as a Domain Administrator, but if the user is a member of any other 
group, they cannot login. 

I have setup my machine to use LDAP for authentication via pam as well, 
and I am currently suspecting some issues with my group mappings, but 
I'm not sure.  This is my first experience with LDAP as well (and by 
extension pam_ldap, etc.), so it could be a possible issue there...

I'm not including any configs, but they can be posted easily.

Any and all help greatly appreciated! I've scoured for help and it could 
be something quite dumb/easy to fix.

Thanks!
-Ben