title: AdWords Remarketing javascript (conversion_async.js) is not loading
body: <p>Per the <a href="https://developers.google.com/adwords-remarketing-tag/asynchronous/#standard-javascript-use" rel="nofollow noreferrer">Google Asynchronous AdWords Remarketing tag instructions</a> I add the following snippet inside the head section of my page:</p>
  
  <pre><code>&lt;script type="text/javascript" src="http://www.googleadservices.com/pagead/conversion_async.js" charset="utf-8"&gt;&lt;/script&gt;
  </code></pre>
  
  <p>But I'm unable to call the google_trackConversion function after page load:</p>
  
  <pre><code>&lt;script type="text/javascript"&gt;
  /* &lt;![CDATA[ */
  window.google_trackConversion({
    google_conversion_id: 123456789, 
    google_custom_params: {
      parameter1: 'abc123', 
      parameter2: 29.99
    },
    google_remarketing_only: true
  });
  //]]&gt;
  &lt;/script&gt;
  </code></pre>
  
  <p>However if copy/paste the code from conversion_async.js to the head section it works just fine, indicating the conversion_async.js file is not loading from the googleadservices.com server.</p>
  
  <p>How can I ensure the conversion_async.js file has already been loaded before calling google_trackConversion?</p>
  
  <p>(BTW, as suggested someplace else I toggled AddBlock Plus on/off but that doesn't have any effect)</p>