Cake 1.3 - Set::insert + $this->set() issue

In a controller I have the following:

        $cities = $this->City->find('all');
        foreach($cities as $x => $c){
            $cities[] = Set::insert($cities[$x], 'ads', array('count' => $this->get_ad_count($c['City']['slug'])));
        }
       //print_r($cities);
       //exit;
        $this->set('cities',$cities);

• When running the code as shown above, with Debug set to '2', the view returns absolutely nothing. Just a white screen.
  
• if I run print_r() I will see a well formatted array with the 'ads' key/value pair inserted correctly.
• If I remove the foreach lines I see a perfectly nice view with the correct data (obviously without the 'ads' stuff) displayed.
  

Might Set::insert be interfering with $this->set in some way?

Perhaps there is some security involved with $this->set that doesn't allow the insertion?

Not sure what gives. Anybody have a clue?

Thanks,

Javier

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