samba - May 2002 - Problems with Samba 2.2.4 and Windows 2k, XP

Hi all:
Recently I installed samba 2.2.4 precompiled version on Solaris 8 (Sparc).
I configured for security=user, my unix users are on smbpasswd file also.
The real problem is when my users try to connect to the samba server.

I recently installed Samba 2.2.4 precompiled for Solaris 2.8 (Sparc).
I have a user on the samba server as group "adm" admins.
This logon works to login to the Windows 2K server on the domain.
If I change the group ID of the user to staff (our standard user group) 
then the user still authenticates but the Windows pop up box states:
"You do not have Access to logon to this session"

Any Idea why this is occurring?