I see, it's the users update page. in the admin/users_update.php page, change line 84:
$WAFV_Errors .= WAValidateEM(((isset($_POST["UserPassword"]))?$_POST["UserPassword"]:"") . "",true,3);
to:
$WAFV_Errors .= WAValidateRQ(((isset($_POST["UserPassword"]))?$_POST["UserPassword"]:"") . "",true,3);
i have logged this as a bug in our bugbase.