User_Agent library is not working?

[eluser]Sein Kraft[/eluser]
Ok, i've tested it on a fresh installation and i can confirm that is_referral() not working at all.

Code:

function try1(){
    echo anchor('welcome/try2');
}

function try2(){
    $this->load->library('user_agent');
    $is_referal = $this->agent->is_referral();

    if($is_referal){
        echo $this->agent->referrer();
    }
}