[Samba] domain admins no longer recognized after reboot?

[Brett Dikeman]

Ok- very odd behavior here.  Our Samba 3.0.0 server was happy as a clam,
domain admins were recognized by client systems.

We rebooted the server recently- the only real change we've made to it-
and now, domain admins aren't recognized.  However,  I was able to use a
user who is supposed to be a domain admin to join a machine to the
domain(!)  Imagine my surprise when Windows Update said "Administrators
Only!"  Same thing on an 'old' box; it no longer recognizes me as a
domain admin.

The RID for Domain Administrator matches- 512, according to 'net
groupmap list'.  From a Win2k Server, using usrmgr, I can verify that
the groups exist, and the users I'm expecting to be in the admin
group(s) are.  What else should I check?  We've got System Operators,
Domain Admins, and Administrators all mapped to the unix group domadm,
and this setup was working fine.  I'm stumped...

Thanks!
Brett