samba - Oct 1998 - master browser = UNKNOWN

Why do I have alternating messages like this in my 
log.nmb:

dump_workgroups: dump workgroup on subnet   133.244.12.18:  netmask=  255.255.25
5.0:
        IPHY(1) current master browser = HAYDN
                BLUES 40099a03 (Samba Server)
                HAYDN 40051003 ()
dump_workgroups: dump workgroup on subnet  UNICAST_SUBNET:  netmask=  133.244.12
..18:
        IPHY(1) current master browser = UNKNOWN
                BLUES 40099a03 (Samba Server)
find_workgroup_on_subnet: workgroup search for IPHY on subnet UNICAST_SUBNET: fo
und


-- 
Chris Christoph P. U. Kukulies kuku@gil.physik.rwth-aachen.de

We are getting these messages repeating  in log.nmbd and suffering related
problems:


[2002/02/28 13:09:22, 4] nmbd/nmbd_workgroupdb.c:dump_workgroups(292)
  dump_workgroups()
   dump workgroup on subnet    10.141.1.191: netmask=    255.255.0.0:
        PMA_NB(1) current master browser = AP-MSG02
                ANNIMG 40009b03 ()
                AP-MSG02 40061013 ()
[2002/02/28 13:09:22, 4] nmbd/nmbd_workgroupdb.c:dump_workgroups(292)
  dump_workgroups()
   dump workgroup on subnet  UNICAST_SUBNET: netmask=    10.141.1.15:
        PMA_NB(1) current master browser = UNKNOWN
                ANNIMG 40009b03 ()
[2002/02/28 13:09:23, 5] libsmb/nmblib.c:read_packet(740)





Any ideas anyone?  The master browser is an NT and is the PDC and is on the
same subnet and is fine.  




# Samba config file created using SWAT
# from ap-ts01 (0.0.0.0)
# Date: 2002/02/28 07:16:06

# Global parameters
[global]
	workgroup = PMA
	netbios name = ANNI
	server string = 
	interfaces = 10.141.1.191/16 lo0
	bind interfaces only = Yes
	security = DOMAIN
	encrypt passwords = Yes
	password server = ap-dc01
	log level = 5
	load printers = No
	disable spoolss = Yes
	show add printer wizard = No
	preferred master = False
	local master = No
	domain master = False
	enhanced browsing = No
	wins server = 10.141.1.15
	winbind uid = 10000-20000
	winbind gid = 10000-20000
	template homedir = /samba/home/%U
	template shell = /sbin/false