I know this is an old support topic, but I was having this issue too, and these workarounds didn’t work for me. Instead, I added the following to my child theme’s functions.php file. Hopefully, this helps someone else …

function avia_builder_admin_css() {
  echo '<style>
    #avia_builder { display: block !important; }
  </style>';
}
add_action('admin_head', 'avia_builder_admin_css');