White line of about 1cm high bottom page

The answer of the developers:

We'll fix this in next version.

For now, I provide you temporarily solution. Put this code in your current active functions.php file:

if (!function_exists('hide_empty_div') && function_exists('wpdiscuz')) {
   add_action('wp_footer', 'hide_empty_div');

   function hide_empty_div() {
       global $post;
       $wpd = wpdiscuz();
       if ($wpd && !$wpd->helper->isLoadWpdiscuz($post)) {
           $css = "<style>#wpdInfo{display:none;}</style>";
           echo $css;
       }
   }
}