Inline js added in tpl should be replaced with drupal #element or add js.

I checked the code in the dfp_tag.tpl.php is the plane javascript. Which causes problem if scripts are moved to bottom. Which left variables in tpl file undefined and raise errors.

  <script type="text/javascript">
    googletag.cmd.push(function() {
      googletag.display("<?php print $tag->placeholder_id ?>");
    });
  </script>

Add that js in the renderable for dfp_tag function. Checked for Blocks causing problem.