Two Master Browsers in newly created Mixed Mode NT4-2003 d..

We are in-process of upgrading to AD from NT4 and currently in Mixed
Mode. Some how, I now have two computer browser groups. One group has
about 15 machines and the other the balance of about 130. It is a
though these two groups were on two different LANs. There is no
problem with mapping drives between machines in the two groups or
typing a UNC address - apparantly because of DNS and WINS - but certain
things appear to depend on the machines browser list and do not
function correctly. One of these is Veritas Backup Exec - we cannot
select a machine that is not in the media server's computer browser
list (My Network Places.)

All of this started when we added an R2 machine to the domain as a DC
and it seems to insist on being a Master Browser as does the WS2003 EE
non-R2 DC.

So, what can we do to get these two to work together?

For now, let's forget the WAN - the problems I am having are right
here, on this IP subnet.

On this IP subnet, I have (2) WS2003 DCs - one is WS2003 EE (non-R2)
and is the result of an inplace upgrade of the former WSNT4 PDC - the
second is WS2003 SE R2 and is a clean install that was added to the
domain as a DC.

Because there is a WSNT4 DC running at another physical location, the
domain is Mixed-mode NT4/AD.

DNS, WINS and DHCP are running on a non-DC WS2003 EE (non-R2).

The non-R2 DC is in one Master Browser camp and the R2 DC is in the
other. Currently, about half of the systems are in one group, and half
in the other.

I have gone in the registry on all Windows Server OS machines, DC or
not, and set the IsDomainMaster to FALSE and MaintainServerList to No -
except for the R2 DC, which I set to TRUE and Yes. I stopped and
started the Computer Browser service on each - only on the R2 box did
it kept running.

I still have two groups - a W2K or WinXP workstation has become Master
or Backup browsers in the one group and the R2 box is the Master
Browser in the other with some W2K or WinXP boxes in its group as
backup servers.

The WINS server shows all machines.

The browstat status output for the R2 DC looks like this:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Status for domain FOXFIRE on transport
\Device\NetBT_Tcpip_{7BF57FAC-271C-4546-B69D-98C0277FB821}
Browsing is active on domain.
Master browser name is: DE-FOXFIRE-04
Master browser is running build 3790
3 backup servers retrieved from master DE-FOXFIRE-04
\\DE-CONTROL-01
\\DE-FOXFIRE-04
\\CAFE2000
There are 51 servers in domain FOXFIRE on transport
\Device\NetBT_Tcpip_{7BF57FAC-271C-4546-B69D-98C0277FB821}
There are 2 domains in domain FOXFIRE on transport
\Device\NetBT_Tcpip_{7BF57FAC-271C-4546-B69D-98C0277FB821}
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The browstat status output for the non-R2 DC looks like this:
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Status for domain FOXFIRE on transport
\Device\NetBT_Tcpip_{390BAB7F-E63D-4929-B1BC-A896BBD68516}
Browsing is active on domain.
Master browser name is: DE-FLIGHT
Master browser is running build 2195
3 backup servers retrieved from master DE-FLIGHT
\\DE-EST-03
\\DE-EST-02
\\DE-FLIGHT
There are 15 servers in domain FOXFIRE on transport
\Device\NetBT_Tcpip_{390BAB7F-E63D-4929-B1BC-A896BBD68516}
Unable to retrieve server list from DE-FLIGHT: 64
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

No machine is connected to the LAN with more than one network adapter.

I have tried reversing the settings between these WS2003 DCs, but it
does not help.