[Samba] problem with synchronize samba and unix password - ldap

[empirium]

I have a such problem.
I have samba 3 as a PDC  with ldap as a authentication backend.
When I use script  "smbldap-passwd user", samba password and unix 
password is changing correct, but when i use Ctr+Alt+Del from windows 
computer samba is changing corectly its password, and I see that unix 
password is also changing but I cannot to log to system with that unix 
password.
Somebody knows why?

part of smb.conf

ldap password sync = Yes
#unix password sync = Yes
passwd program = /usr/sbin/smbldap-passwd -u %u
update encrypted = yes
encrypt passwords = yes


smbldap.conf

hash_encrypt="CRYPT"
crypt_salt_format="%s"    

Thanks in advance
luk