CodeIgniter 2 - captcha helper? - codeigniter

Question

I cant seem to get CI2's captcha helper to work... Can someone point out what I am doing wrong?
I think I've followed all the steps on the doc's but Im not getting anything event a print_r(get_defined_vars()) isnt showing anything... :(
My Controller
function index()
{
$this->load->helper('form');
$this->load->helper('captcha');
$this->load->model('captcha');
$vals = array(
'word' => 'Random word',
'img_path' => '../images/captcha/',
'img_url' => 'http://mysite/images/captcha/',
'font' => '../../system/fonts/texb.ttf',
'img_width' => '150',
'img_height' => 30,
'expiration' => 7200,
"time" => time()
);
$data['cap'] = create_captcha($vals);
$cap = array(
'captcha_time' => $vals['time'],
'ip_address' => $this->input->ip_address(),
'word' => $vals['word']
);
$this->captcha_model->insert_captcha($cap);
//print_r(get_defined_vars());
$data['main_content'] = 'admin/landing.php';
$this->load->view('includes/template', $data);
}
My Model
function input_captcha($data)
{
$query = $this->db->insert_string('captcha', $data);
$this->db->query($query);
}
My View
<section>
<h3>You must captcha this captcha before proceeding to your demise!</h3>
<article>
<?php echo form_open('admin/auth');?>
<p>Who the F are you?</p>
<?php echo form_input('email', 'your real email!');?>
<br>
<?php echo 'Submit the word you see below:';?>
<br>
<?php echo $cap['image'];?>
<br>
<?php echo '<input type="text" name="captcha" value="" />'; ?>
<br>
<?php echo form_submit('submit', 'Send It!');?>
<?php echo form_close();?>
</article>
</section>

Answer 1

The problem was in the path's for images. One thing, even with the log threshold set to four, I was getting NO indication of any kind of problem. I set it to absolute paths and everything worked fine...
function index()
{
$this->load->helper('form');
$this->load->helper('captcha');
$this->load->model('captcha_model');
$vals = array(
'img_path' => '/var/www/mysite.com/images/captcha/',
'img_url' => 'http://mysite.com/images/captcha/',
'font' => '../../system/fonts/texb.ttf',
'img_width' => '150',
'img_height' => 30,
'expiration' => 7200,
"time" => time()
);
$data['cap'] = create_captcha($vals);
$cap = array(
'captcha_time' => $data['cap']['time'],
'ip_address' => $this->input->ip_address(),
'word' => $data['cap']['word']
);
$this->captcha_model->add_captcha($cap);
$data['main_content'] = 'admin/landing.php';
$this->load->view('includes/template', $data);
}