Adding Profile2 fields to user registration
I had this in my module:

unset($form['profile_memberlist']);


Which is what I needed to do so I could override and theme the way the form elements were presented.  I commented that out but then I got a dual display of form elements, which I was able to disable with the follwing code:

$form['profile_memberlist'] = array(
      '#type' =&gt; 'hidden',
);