Cannot sign out!!

[eluser]NikosV[/eluser]
Any ideas why i cannot sign out while on ie8? Everything seems to work fine only when i disable Protected mode on security tab in browser's internet properties.

Code:

class Signout extends Controller
{
    function index()
    {
        
        session_name('what_ever');
        session_start();
        if(isset($_SESSION['username'])) { unset($_SESSION['username']); }
        if(isset($_SESSION['loggedin'])) { unset($_SESSION['loggedin']); }
        if(isset($_SESSION['notification'])){ unset($_SESSION['notification']); }
        session_destroy();
        
        setcookie('cook_email',"", time()-60*60*24*100, "/");
        setcookie('cook_pass',"", time()-60*60*24*100, "/");
        
        redirect('home','refresh');
    }
}

?>