Can't access SMB shares of AD joined RN316

I hadn't tried the "Setting Active Directory folder permissions on ReadyNAS OS6" article, so I did. I got to the first couple steps of part 3. I had used the administrator account when joining the NAS to the domain. I logged into a domain controller as administrator and tried to open the \\nas share. It wanted a user & pw. It would not accept the administrator user&pw. It did take the NAS's built in admin & pw.I tried changing the permissions on my test folder and Windows said I don't have permission to view or edit the object's permission settings. It won't let me change the folder's owner, saying access is denied. The only thing I can do with SMB is view the list of shares & I can only do that with the NAS's built in admin account. I'm e-mailing the logs now.