Problems with parent item selection.

I had to comment out a chunk of Javascript in menu-block.js in order to get this module to work. For some reason when it tries to split the parent item selection into two select lists, something breaks. I end up with menus being duplicated in the menu select list and then nothing except "" shows up in the item select list. I've attached some screen shots.

If I comment out the following block in menu-block.js, I get one big parent item select list that works:

  // Split the un-wieldly "parent item" pull-down into two hierarchal pull-downs.
  $('#edit-parent')
    .html(Drupal.settings.menu_block.parent_options[Drupal.settings.menu_block.menus_default])
    .val(Drupal.settings.menu_block.parent_default)
    .before(Drupal.settings.menu_block.menus);
  $('#edit-parent-menu').change( function() {
    $('#edit-parent')
      .html(Drupal.settings.menu_block.parent_options[$('#edit-parent-menu').val()])
      .val(Drupal.settings.menu_block.parent_default);
  } );

I had this problem with both the latest release and the latest dev. I was surprised not to find anyone else with the same problem.

Any ideas?