strange nmblookup discrepancy

[eje4]

Hello, 

I'm using Samba 3.0.22 and have it set up as a PDC.  I've recently found
that for some reason I'm unable to join a WinXP client to the domain that is
being controlled by Samba.  In the process of trying to troubleshoot this I
noticed a strange discrepancy.  When I run "nmbclient -M PLAB" (where PLAB
is the name of our domain) on the Samba server machine, shouldn't I get a
response back indicating that the server machine, i.e. the machine I am
running the nmblookup command on, is the master browser for the PLAB domain? 
But I don't get that.  Instead I get a list of several client machines on
our domain, none of which is configured as a master browser or a domain
controller.  

Does anyone know of a reason why nmblookup would not be able to recognize
the master browser properly?  Here's the contents of our [global] section of
smb.conf:

        socket options = TCP_NODELAY
        invalid users = bin daemon adm sync shutdown halt mail news uucp
        max log size = 100
        print command = /bin/lp -d%p %s; sleep 5; rm -f %s
        printer = 128_1
        printing = SYSV

        netbios name = pleiades
        workgroup = PLAB
        passdb backend = smbpasswd
        os level = 65
        preferred master = yes
        domain master = yes
        local master = yes
        security = user
        domain logons = yes
        logon drive = h:
        logon path =
        logon script = %U.bat

        log file = /var/log/samba.log
        log level = 2
        max log size = 500
        debug timestamp = yes

        encrypt passwords = yes
 
Thanks very much,
Eric

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