Curious NetBios over TCP/IP issues and Windows SMB shares

Hi all.
I've got two Win 2003 R2 SP2 member servers on our AD domain. Each has shared network folders on them which are accessed by both Windows and Mac users.
Both servers - lets call them ALPHA and BETA - are identically setup: same hardware, configuration etc. but exist on different subnets.
Alpha has never had a problem with Mac clients connecting to any of its shares.
Beta has, up until recently, only ever had Windows clients, but now has a couple of Snow Leopard Mac clients. When a Mac client attempts to connect via SMB or CIFS to any share on Beta - they get the prompt to authenticate and then "Connection Failed. There was an error connecting to the server Beta. Check the server name or IP address and then try again". Of course the same thing happens when I try to connect by IP.
Curiously, the only way I can get Mac clients to connect to shares on Beta is to go into the network adapter settings on Beta, advanced, WINS and then disable NetBios over TCP/IP. Unfortunatley this breaks some unrelated stuff and I eventually have to go back in and set NetBios back to Default (enabled) and the whole thing screws up again in a few hours time again for my beloved Mac users.
The other server Alpha never gives me any problem with Mac clients, and as I say, they are setup identically. I have been testing this with 10.6.3 clients, not sure if my 10.5 or 10.4 clients are affected.
Can anyone offer some suggestions as to why my shares aren't accessible to my Mac clients on both servers?

Generally it is the browser service that populates network neighborhood. This technology is no longer used with newer OS like server 2008, windows 7/8.
Description of the Microsoft Computer Browser Service
Regards, Dave Patrick ....
Microsoft Certified Professional
Microsoft MVP [Windows]
Disclaimer: This posting is provided "AS IS" with no warranties or guarantees , and confers no rights.

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