samba - May 2005 - paw_winbind.so reporting Wrong Password

Hi,
 
I have:
 
samba-3.0.14a
krb5-1.4.1
 
on Fedora Core 3
 
and a 2003 based Active directory
 
 
I have joined the linux box to the domain and everything seems OK. wbinfo -u
comes back with the correct users, wbinfo -a user%pass authenticates fine
and net ads testjoin comes back OK.
 
However when I put the line: auth        sufficient
/lib/security/pam_winbind.so
in /etc/pam.d/system-auth
 
I start getting errors like this in /var/log/messages:
 
 
May 17 17:08:37 newmail pam_winbind[2376]: request failed: Wrong Password,
PAM error was 7, NT error was NT_STATUS_WRONG_PASSWORD
 
 
I was just wondering if this is a misconfiguration on my part of the PAM
settings or something else.
 
Any help appreciated,
 
thanks,
 
Mark