Mariette ,

 

I've worked on this problem in the weekend.

 

The following function in the show_ads.js cause the problem.

 

function google_write_iframe(w, d, ad_url) {
  ad_url = ad_url.substring(0, 1000);
  ad_url = ad_url.replace(/%\w?$/, '');

  if (w.google_ad_output == 'js' &&
      (w.google_ad_request_done || w.google_radlink_request_done)) {
    d.write('<script language="JavaScript1.1"' +
            ' src=' + quoted(ad_url) + '></' + 'script>');
  } else if (w.google_ad_output == 'html') {
    if (w.name == 'google_ads_frame') {
      google_write_tracker(d, ad_url, 'reboundredirect');
    } else {
      d.write('<iframe' +
              ' name="google_ads_frame"' +
              ' width=' + quoted(w.google_ad_width) +
              ' height=' + quoted(w.google_ad_height) +
              ' frameborder=' + quoted(w.google_ad_frameborder) +
              ' src=' + quoted(ad_url) +
              ' marginwidth="0"' +
              ' marginheight="0"' +
              ' vspace="0"' +
              ' hspace="0"' +
              ' allowtransparency="true"' +
              ' scrolling="no">');
      google_write_tracker(d, ad_url, 'noiframe');
      d.write('</iframe>');
    }
  }
}

Unfortunely I am not able to find a solution to this issue.

I will continue investigating this issue and will get back to you if I find a solution.