[Samba] Network browses empty since client IP change/clash

[Johnny]

Hi guys,

I am encountering this very strange problem with running of samba (v.
samba-3.0.1-2).  In one occasion, I needed to swap the ethernet cards
between two clients (both Windows CP as well as the IPs according in
dhcpd server.  There was this incident of IP conflict warning on one
client I renewed the IP (after dhcpd restarted) while the other client
still had the same IP.  This was quickly corrected by refreshing this
other client's IP and everything seemed to be ok.

However, after this, in both clients (or other clients that were later
added), My Network Places are always empty without showing any clients
in the workgroup (yes, the workgroup itself shows), not even samba
server itself.  Although it gives empty workgroup content, I have no
trouble at all to ping/browse in the clients between each other and the
server by typing \\IP or \\hostname.  Command "net view hostname" in
Windows XP command prompt also successfully returns shared resources
(folders and printers).  Mapping as network drives directly on the
clients also work perfectly as before.  Here only thing that goes wrong
is the Network Places browsing (and it is quite serious :().

I have tried different way to fix it, without much luck (delete samba
cache, flush DNS and WINS cache in the clients).  I particularly
mentioned the IP change incident since it is what I remember the last
thing I did before this problem pops up.  Except recently I upgraded
from samba 3.0.0.2.

Can anyone here help me with this, any advise and help would be really
great.  I am running out of ideas :(

Thanks alot,
Johnny

smb.conf
======================
# Global parameters
[global]
          smb passwd file = /etc/samba/smbpasswd
          passwd program = /usr/bin/passwd %u
          pam password change = yes
          encrypt passwords = yes
          max log size = 50
          obey pam restrictions = yes
          passwd chat = *New*password* %n\n *Retype*new*password* %n\n
*passwd:*all*authentication*tokens*updated*successfully*
          security = user
          unix password sync = yes
          workgroup = MYHOME
          server string = My Server Computer
          netbios name = server
          log file = /var/log/samba/%m.log
          hosts allow = 192.168.50.
          # printing options
          printing = cups
          printcap name = cups
          load printers = yes
          show add printer wizard = yes
          printer admin = me
          display charset = UTF8
          # configure server to be a WINS server
          wins support = yes
          name resolve order = wins lmhosts bcast
          # alert SAMBA to use configured DNS or not
          dns proxy = no
          # allow samba server to broadcast via specified interface(s)
          interfaces = br0
          # configure this machine to be browser server
          local master = yes
          domain master = yes
          preferred master = yes
          # global share drive settings
          preserve case = yes
          # perfomance enhancement settings
          socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192

#[homes]
#comment = Home Directories
#read only = no
#browseable = yes

[my-share]
          comment = general files
          path = /mnt/my-share
          read only = no
          browseable = yes

[my-backup]
          comment = backup files
          path = /mnt/my-backup
          read only = no
          browseable = yes

[my-archive]
          comment = temporary files
          path = /mnt/my-archive
          read only = no
          browseable = yes

[printers]
          comment = All Printers
          path = /var/spool/samba
          browseable = yes
          guest ok = no
          writable = no
          printable = yes
          use client driver = yes

[print$]
          comment = Printer Drivers
          path = /etc/samba/drivers
          guest ok = no
          browseable = no
          read only = yes
          write list = me