[Samba] pdbedit - can't set password expiry, etc?

[Justin]

Hi All

Have recently moved from a machine running 2.2 to a new machine running
3.0.10-1. I've just converted the smbpasswd database to tdbsam as I
understand password ageing etc does not work with smbpasswd. I've set
the line 'passdb backend = tdbsam' in the smb.conf, restarted the daemon
and now I'm trying to force a user account to have to change his
password the next time he logs in. I'm using the command 

    #pdbedit -u justinh --pwd-must-change-time 0

and also tried

    #pdbedit --pwd-must-change-time=0 justinh

but neither seems to modify the user;

    # pdbedit -Lv justinh
    Unix username:        justinh
    NT username:
    Account Flags:        [U          ]
    User SID:             S-1-5-21-179224907-3521905181-1287225574-2032
    Primary Group SID:    S-1-5-21-179224907-3521905181-1287225574-2201
    Full Name:            Justin.Hyde
    Home Directory:       \\agnes\justinh
    HomeDir Drive:
    Logon Script:         "logon.bat"
    Profile Path:         \\agnes\justinh\profile
    Domain:               MIDALIA
    Account desc:
    Workstations:
    Munged dial:
    Logon time:           0
    Logoff time:          Sat, 14 Dec 1901 04:45:51 GMT
    Kickoff time:         Sat, 14 Dec 1901 04:45:51 GMT
    Password last set:    Fri, 29 Jul 2005 13:12:12 GMT
    Password can change:  Fri, 29 Jul 2005 13:12:12 GMT
    Password must change: Sat, 14 Dec 1901 04:45:51 GMT
    Last bad password   : 0
    Bad password count  : 0
    Logon hours         : FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF


Can anyone suggest where I've gone wrong here?


TIA

Justin