samba - Dec 2007 - problems upgrading from 3.0.10 to 3.0.25b-0.4?

Hoping this is an error of stupidity or ignorance on my part.

Running Centos 4.6, after the big update from 4.5.

Samba would not communicate with our samba PDC (3.0.10), kept getting  
NT_STATUS_BAD_NETWORK_NAME errors.

I will most likely update all our samba servers, but do not want to do 
it knowing that the two versions may not talk.

Here's my smb.conf, currently functional - does not work once upgraded...

# Samba config file created using SWAT
# from 10.1.1.206 (10.1.1.206)
# Date: 2006/09/08 09:24:26

# Global parameters
[global]
    unix charset = ISO8859-1
    workgroup = STANDARD
    server string = Technology Server
    interfaces = eth0, eth1, localhost
    null passwords = Yes
    password server = staff
    passdb backend = ldapsam:ldap://ldap.example.com
    client NTLMv2 auth = Yes
    client lanman auth = No
    client plaintext auth = No
    log level = 1
    log file = /var/log/samba/%m.log
    max log size = 50
    max open files = 59392
    socket options = TCP_NODELAY SO_RCVBUF=8192 SO_SNDBUF=8192
    add user script = /usr/local/sbin/smbldap-useradd -m %u
    delete user script = /usr/local/sbin/smbldap-userdel %u
    add group script = /usr/local/sbin/smbldap-groupadd -p %g
    delete group script = /usr/local/sbin/smbldap-groupdel %g
    add user to group script = /usr/local/sbin/smbldap-groupmod -m  %u %g
    delete user from group script = /usr/local/sbin/smbldap-groupmod -x  
%u %g
    set primary group script = /usr/local/sbin/smbldap-usermod -g  %g
    add machine script = /usr/local/sbin/smbldap-useradd -w  %u
    logon script = %U.bat
    os level = 180
    lm announce = Yes
    preferred master = No
    domain master = No
    dns proxy = No
    wins server = 10.1.0.22
    ldap admin dn = cn=samba,ou=dsa,dc=example,dc=com
    ldap delete dn = Yes
    ldap group suffix = ou=Groups
    ldap machine suffix = ou=Computers
    ldap passwd sync = Yes
    ldap suffix = dc=example,dc=com
    ldap ssl = no
    ldap user suffix = ou=Users
    idmap backend = ldap:ldap://ldap.example.com
   idmap uid = 16777216-33554431
   idmap gid = 16777216-33554431
    admin users = administrator, root
    write list = administrator, root, @staff
    profile acls = Yes
    veto files = /.AppleDouble/.bin/.AppleDesktop/Network Trash 
Folder/TheFindByContentFolder/TheVolumeSettingsFolder
    veto oplock files = /*.mdb/*.ldb/*.mdw/*.dbf/*.dat/*.fpt/*.cdx/*.idx/

   security = user
   template shell = /bin/false
   winbind use default domain = no
    msdfs proxy = no

[homes]
    comment = Home Directories
    valid users = %U
    read only = No
    create mask = 0700
    force create mode = 0700
    security mask = 00
    force security mode = 0700
    directory mask = 0700
    force directory mode = 0700
    directory security mask = 00
    browseable = No

[printers]
    comment = All Printers
    path = /var/spool/samba
    printable = Yes
    use client driver = Yes
    browseable = No

[Profiles]
    path = /home/samba/profiles
    valid users = %U, '@Domain Admins'
    force user = %U
    read only = No
    create mask = 0600
    directory mask = 0700
    guest ok = Yes
    browseable = No

[netlogon]
    path = /home/samba/netlogon/
    guest ok = Yes
    browseable = No
    available = No

[print$]
    path = /home/drivers/
    admin users = administrator, jdavis
    write list = administrator, jdavis
    guest ok = Yes

[install]
    comment = install
    path = /home/unattended/install
    read list = dummy
    read only = No
    create mask = 0777
    force create mode = 0777
    directory mask = 0777
    force directory mode = 0777
    delete readonly = Yes

[Software]
        comment = install
        path = /home/software/
    write list = "@Domain Admins"
        read only = No
        create mask = 0777
        force create mode = 0777
        directory mask = 0777
        force directory mode = 0777
        delete readonly = Yes

[Browser-Config]
        comment = Browser Config Plugin
        path = /home/browser-config
        read only = No
        create mask = 0777
        force create mode = 0777
        directory mask = 0777
        force directory mode = 0777
        delete readonly = Yes

[Packages]
        comment = Browser Config Plugin
        path = /home/packages
        read only = No
        create mask = 0777
        force create mode = 0777
        directory mask = 0777
        force directory mode = 0777
        delete readonly = Yes

[pref.js_inbox]
    comment = install
    path = /home/prefs.js_inbox
    read list = @staff
    write list = @staff
    read only = No
    create mask = 0777
    force create mode = 0777
    directory mask = 0777
    force directory mode = 0777
    delete readonly = Yes

[pref.js_outbox]
    comment = install
    path = /home/prefs.js_outbox
    read list = @staff
    write list = @staff
    read only = No
    create mask = 0777
    force create mode = 0777
    directory mask = 0777
    force directory mode = 0777
    delete readonly = Yes