I have successfully joined a new RH 4 server to our AD Domain. Winbind is configured as proper as I can tell. kinit user cammands work for all AD users, wbinfo will return usernames, groups, etc.
Problem occurs when I try to access Samba shares from any Windoz box, I get prompted for a username and password. NO AD user account will work, only Root to access the shares.
Closing this as invalid. This sounds very much like a question you should better ask on email@example.com.