After updating to the latest Usermin, when users logged in to change the Samba Password via the Change Password module, doesn't changed it.
Just to be more precise, it can update the Unix Account password, and it seems to be able to reset the Smbpasswd as well, but it just doesn't seems to work or change correctly.
Only through WEBMIN (which will change other modules' password) works.
check_ntlm_password: Authentication for user  ->  FAILED with error NT_STATUS_WRONG_PASSWORD
Did this used to work with the older version of Usermin?
Yup. And what i did now is to uninstall "usermin-1.600", and re-install "usermin-1.590".
Back to normal.
Ok, I see the bug here - this will be fixed in the 1.610 Usermin release.