Cannot Browse Network

I have 3 W2K (spk2) and 4 NT40(spk 6) servers all in the same domain, mix mode. Also workstations are W2K. Users data are located on NT40 server(NYC211). Problem; ON WKST1 a User or Administrator can login and get mappings and able to browse and ping all servers.
If I take the same user or Administrator to WKSTA2 they can log onto the network. They are able to Ping all (servers by IP or Name) they are able to browse all servers EXCEPT NYC211 server where their user data files are. Cannot mapto this server.
Any Help,
Thanks