function __construct() {} is not called...?

[eluser]enigmas[/eluser]
I'm using CI 1.72 with PHP 5.2.17, when I open a method of controller in browser, I got a lot of errors that says that form/url/cookie helpers' functions are not found, but these helper are being loaded in "function __construct()"

Everything is looking like "function __construct()" is not called...

Did anybody have such problem..?

PS: If I move all helpers loaders from "function __construct()" to the beginning of the method functions, everything is working.

Code:

class Login extends Login_Controller {
        
    function __construct() {
        parent::__construct();

        $this->load->helper(array('form','url','html', 'cookie'));
        $this->load->library('form_validation');
        $this->load->library('session');
        
        $this->load->model('login_model');
    }

more strange that same code works well with php 5.2.14