Ok I found
Modifiying the CBauthentification.php, line 275 (CB.2.1.4), replace
Code:
$posLname = strrpos( $user->name, ' ' );
By
Code:
$posLname = strpos( $user->name, ' ' );
Formating the firstname as described above,
work for exemple with
Jean-Marc De La Ménardière where
De La Ménardière is only the lastname
Eric