samba - Feb 2004 - Group membership doesn't seem to be working correctly

I have a problem with a new 3.02a server using tdbsam (so far).

When I enter the following command I get what I expect.

[root@boc root]# net rpc user info dshadix
Password:
Domain Admins

but when I do this

[root@boc root]# net rpc group list "Domain Admins"
Password:


I get nothing in response. I also tried it with domadmins with the same 
result.

[root@boc root]# net getlocalsid
SID for domain BOC is: S-1-5-21-2139319003-395651990-968895117

[root@boc root]# net groupmap list | grep Admins
Domain Admins (S-1-5-21-2139319003-395651990-968895117-512) -> domadmins

[root@boc root]# grep domadmins /etc/group
domadmins:x:512:dshadix

I created a folder and put the following in smb.conf

[public]
        comment = Boise clinic Shared Stuff
        path = /home/samba
        write list = @domadmins
        read only = No
        guest ok = Yes

and I can't write to it.  If I change the write list to dshadix I can.

Please help me.