Sample for troubleshooting

// Register post type
add_action( 'init', 'cw_create_ci_ads' );
function cw_create_ci_ads() {
    register_post_type( 'ci_ads',
        array(
            'labels' => array(
                'name' => 'Ads',
                'singular_name' => 'Ad',
                'add_new' => 'Add New',
                'add_new_item' => 'Add New Ad',
                'edit' => 'Edit',
                'edit_item' => 'Edit Ad',
                'new_item' => 'New Ad',
                'view' => 'View',
                'view_item' => 'View Ad',
                'search_items' => 'Search Ads',
                'not_found' => 'No Ads found',
                'not_found_in_trash' => 'No Ads found in Trash'
            ),
			'hierarchical' => true,
			'public' => true,
			'exclude_from_search' => true,
            'menu_position' => 30,
            'supports' => array( 'title','thumbnail','page-attributes'  ),
            'taxonomies' => array( '' ),
            'menu_icon' => plugins_url( 'images/icon-ci_ads.png', __FILE__ ),
            'has_archive' => true,
			'rewrite' => array('slug' => 'ads'),
        )
    );
}

// Add columns to the overview page for a cpt
function cw_add_custom_columns( $cols ) {
  $cols = array(
    'cb' => '<input type="checkbox" />',// leave this here or mass edit/delete will not work
    'title' => __( 'Title' ),
	'ci_ad_size' => __( 'Size' ),
	'ci_ad_url' => __( 'URL' ),  );
  return $cols;
}
add_filter( "manage_ci_ads_posts_columns", "cw_add_custom_columns" );

// Populate the columns
function cw_populate_custom_columns( $column, $post_id ) {
  switch ( $column ) {
	case "ci_ad_size":
      $ad_size = get_post_meta( $post_id, 'ci_ad_size', true);
      echo '<a style="text-transform:capitalize;" href="' . $ad_size . '">' . $ad_size. '</a>';
      break;
	case "ci_ad_url":
      $ad_url = get_post_meta( $post_id, 'ci_ad_url', true);
      echo '<a href="' . $ad_url . '">' . $ad_url. '</a>';
      break;
    case "ci_ad_image":
      $ad_image = get_post_meta( $post_id, the_post_thumbnail(), true);
      echo '<a href="' . $ad_image . '">' . $ad_image. '</a>';
      break;
  }
}
add_action( "manage_posts_custom_column", "cw_populate_custom_columns", 10, 2 ); // what are the 10 and 2?

// Make the new columns sortable
function cw_sortable_custom_columns() {
  return array(
    'ci_ad_url' => 'ci_ad_url',
	'ci_ad_size' => 'ci_ad_size'
  );
}
add_filter( "manage_edit-ci_ads_sortable_columns", "cw_sortable_custom_columns" );