[Samba] unable to browse with smbclient

[Sam Seaver]

I've no doubt this may have come up already, but I cant seem to find any 
hints.

Ive recently upgraded from samba-2.2.8 to samba-3.0.0.

I use it as a PDC for about 5 win2k machines and 2 NT4 machines.  It's 
working fine, but Im having trouble with smbclient.

Where before I could login to a machine remotely using the administrator 
password, now it denies me access??

Is there a new configuration in smb.conf that changes this?

thanks
Sam Seaver