samba - Feb 2014 - Samba 3.9 + AD: Print share permissions difficulties

Trying to print to a printer share on a Samba 3.9 printer server. When
I print a test page from a domain administrator account, I get:
> The document Print Document, owned by Administrator, failed to print
> on printer \\printer-server\SAVIN_SECONDARY. Try to print the document
> again, or restart the print spooler.
> Data type: RAW. Size of the spool file in bytes: 191277. Number of
> bytes printed: 0. Total number of pages in the document: 1. Number of
> pages printed: 0. Client computer: \\WINDOWS-SERVER-2. Win32 error
> code returned by the print processor: 5. Access is denied.
in the event log. For the life of me, I can't figure out why, and I've
been working on this, one way or another, for over a week. It's driving
me mad...

Complete smb.conf follows (minor substitution in workgroup and realm
names):

[global]

        workgroup = WINDOWS
        realm = WINDOWS.EXAMPLE.COM
        server string = Samba Server Version %v
        # load printers = yes
        security = ads
        local master = no
        domain master = no
        preferred master = no
        socket options = TCP_NODELAY IPTOS_LOWDELAY SO_RCVBUF=131072
        SO_SNDBUF=131072 use sendfile = true
        wins server = 10.161.1.32
        dns proxy = no
        idmap config * : backend = autorid
        idmap config * : range = 16777216-33554431

        winbind separator = +
        winbind enum users = yes
        winbind enum groups = yes
        winbind use default domain = yes
        winbind nested groups = yes
        winbind expand groups = 2
        winbind refresh tickets = yes
        winbind uid = 16777216-33554431
        winbind gid = 16777216-33554431
        template homedir = /home/%D/%U
        template shell = /bin/bash
        interfaces = eth0 lo
        log file = /var/log/samba/log.%m
        max log size = 50
        invalid users = root
        valid users = administrator
        write list = administrator

        client use spnego = yes
        client ntlmv2 auth = yes
        encrypt passwords = yes
        restrict anonymous = 2

[SAVIN_MAIN]
        print ok = yes
        writeable = yes
        printing = cups
        path = /var/spool/samba
        comment = SAVIN MAIN (C9135)

[SAVIN_SECONDARY]
        print ok = yes
        writeable = yes
        printing = cups
        path = /var/spool/samba
        valid users = administrator
        write list = administrator
        admin users = administrator
        comment = SAVIN SECONDARY (C3535)

[SAVIN_LARGEFORMAT]
        print ok = yes
        writeable = yes
        printing = cups
        path = /var/spool/samba
        comment = SAVIN LARGEFORMAT (2406WD)

[homes]
comment = Home Directories
        browseable = no
        writable = yes
        force create mode = 0004
        force directory mode = 0005
        root preexec = /var/lib/samba/scripts/mkuserdir %u
        valid users = %S


...

For the curious, yes, the homes shares work fine.

net rpc rights list accounts -Uadministrator :

BUILTIN\Print Operators
No privileges assigned

BUILTIN\Account Operators
No privileges assigned

BUILTIN\Backup Operators
No privileges assigned

BUILTIN\Server Operators
No privileges assigned

BUILTIN\Administrators
SeMachineAccountPrivilege
SeTakeOwnershipPrivilege
SeBackupPrivilege
SeRestorePrivilege
SeRemoteShutdownPrivilege
SePrintOperatorPrivilege
SeAddUsersPrivilege
SeDiskOperatorPrivilege
SeSecurityPrivilege
SeSystemtimePrivilege
SeShutdownPrivilege
SeDebugPrivilege
SeSystemEnvironmentPrivilege
SeSystemProfilePrivilege
SeProfileSingleProcessPrivilege
SeIncreaseBasePriorityPrivilege
SeLoadDriverPrivilege
SeCreatePagefilePrivilege
SeIncreaseQuotaPrivilege
SeChangeNotifyPrivilege  
SeUndockPrivilege
SeManageVolumePrivilege  
SeImpersonatePrivilege   
SeCreateGlobalPrivilege  
SeEnableDelegationPrivilege

Everyone
No privileges assigned   

WINDOWS\Domain Admins
SePrintOperatorPrivilege 

net sam rights list SePrintOperatorPrivilege -Uadministrator:

BUILTIN\Administrators
WINDOWS\Domain Admins
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