Node reference fields do not get titles rendered as chart labels

Thank you. Will look into it and get back to you.

the same problem applies to fields that have rewriting enabled (through tokens or otherwise). Rather annoying.

Changing status as the suggested solution is not really feasible.

Fix #1 is badly for me because it brakes rows without node references. So this is my fast and ugly fix for foreach cycle from line 178:

foreach ($db_rows as $row ) {
      $cols = (array)$row;
      foreach ($cols as $key => $col ) {
        if ( trim($key) == trim($x_label_column) ) {
		 if (node_load($row->$key)) {
         $load_refs = node_load($row->$key);
         $labels[] = $load_refs->title;
		 }
		 else {
		 $labels[] = $row->$key;
		 }
        }
        if (array_key_exists($key, $fields_x_names)) {
          $full_name = $fields_x_names[$key];
          $rows[$full_name][] = (float)$col;
        }        
      }
    }

I've created the following test situation:
Node types: news and newspaper.
The news content type references newspaper.
I created the view below to chart the number of news per newspaper.
It worked as expected, i.e., the chart have the aggregate values per newspaper and the newspaper names were present as the labels.
Please observe that you have to create a relationship between news and newspaper in the view. You can't use the ref field available in news directly otherwise the result won't be aggregated.
Please reopen if the problem persists.

$view = new view;
$view->name = 'test_views_charts_node_referenc';
$view->description = '';
$view->tag = '';
$view->view_php = '';
$view->base_table = 'node';
$view->is_cacheable = FALSE;
$view->api_version = 2;
$view->disabled = FALSE; /* Edit this to true to make a default view disabled initially */
$handler = $view->new_display('default', 'Defaults', 'default');
$handler->override_option('relationships', array(
  'field_newspaper_ref_nid' => array(
    'label' => 'Newspaper',
    'required' => 0,
    'delta' => -1,
    'id' => 'field_newspaper_ref_nid',
    'table' => 'node_data_field_newspaper_ref',
    'field' => 'field_newspaper_ref_nid',
    'relationship' => 'none',
  ),
));
$handler->override_option('fields', array(
  'title' => array(
    'label' => 'Title',
    'alter' => array(
      'alter_text' => 0,
      'text' => '',
      'make_link' => 0,
      'path' => '',
      'link_class' => '',
      'alt' => '',
      'prefix' => '',
      'suffix' => '',
      'target' => '',
      'help' => '',
      'trim' => 0,
      'max_length' => '',
      'word_boundary' => 1,
      'ellipsis' => 1,
      'html' => 0,
      'strip_tags' => 0,
    ),
    'empty' => '',
    'hide_empty' => 0,
    'empty_zero' => 0,
    'link_to_node' => 0,
    'exclude' => 0,
    'id' => 'title',
    'table' => 'node',
    'field' => 'title',
    'relationship' => 'field_newspaper_ref_nid',
  ),
  'nid' => array(
    'label' => 'Nid Count',
    'alter' => array(
      'alter_text' => 0,
      'text' => '',
      'make_link' => 0,
      'path' => '',
      'link_class' => '',
      'alt' => '',
      'prefix' => '',
      'suffix' => '',
      'target' => '',
      'help' => '',
      'trim' => 0,
      'max_length' => '',
      'word_boundary' => 1,
      'ellipsis' => 1,
      'html' => 0,
      'strip_tags' => 0,
    ),
    'empty' => '',
    'hide_empty' => 0,
    'empty_zero' => 0,
    'link_to_node' => 0,
    'exclude' => 0,
    'id' => 'nid',
    'table' => 'node',
    'field' => 'nid',
    'relationship' => 'none',
  ),
  'views_sql_groupedfields' => array(
    'label' => 'Group By Fields',
    'alter' => array(
      'alter_text' => FALSE,
      'text' => '',
      'make_link' => FALSE,
      'path' => '',
      'alt' => '',
      'link_class' => '',
      'prefix' => '',
      'suffix' => '',
      'target' => '',
      'trim' => FALSE,
      'max_length' => '',
      'word_boundary' => TRUE,
      'ellipsis' => TRUE,
      'strip_tags' => FALSE,
      'html' => FALSE,
    ),
    'empty' => '',
    'hide_empty' => 0,
    'empty_zero' => 0,
    'exclude' => '1',
    'id' => 'views_sql_groupedfields',
    'table' => 'views_groupby',
    'field' => 'views_sql_groupedfields',
    'relationship' => 'none',
    'views_groupby_fields_to_group' => array(
      'title' => 'title',
    ),
    'views_groupby_sql_function' => 'count',
    'views_groupby_fields_to_aggregate' => array(
      'nid' => 'nid',
    ),
    'views_groupby_field_sortby' => 'nid',
    'views_groupby_sortby_direction' => 'desc',
  ),
));
$handler->override_option('filters', array(
  'type' => array(
    'operator' => 'in',
    'value' => array(
      'news' => 'news',
    ),
    'group' => '0',
    'exposed' => FALSE,
    'expose' => array(
      'operator' => FALSE,
      'label' => '',
    ),
    'id' => 'type',
    'table' => 'node',
    'field' => 'type',
    'relationship' => 'none',
  ),
));
$handler->override_option('access', array(
  'type' => 'none',
));
$handler->override_option('cache', array(
  'type' => 'none',
));
$handler->override_option('style_plugin', 'charts');
$handler->override_option('style_options', array(
  'views_charts_series_fields' => array(
    'nid' => 'nid',
  ),
  'views_charts_x_labels' => 'title',
  'width' => '500',
  'height' => '600',
  'engine' => 'amcharts',
  'type' => array(
    'amcharts' => 'pie',
    'bluff' => 'line',
    'google-charts' => 'line',
    'open-flash' => 'line',
  ),
  'wmode' => 'window',
  'y_min' => '0',
  'y_legend' => '',
));
$handler = $view->new_display('page', 'Page', 'page_1');
$handler->override_option('path', 'test_views_charts_node_reference');
$handler->override_option('menu', array(
  'type' => 'none',
  'title' => '',
  'description' => '',
  'weight' => 0,
  'name' => 'navigation',
));
$handler->override_option('tab_options', array(
  'type' => 'none',
  'title' => '',
  'description' => '',
  'weight' => 0,
  'name' => 'navigation',
));

Forgot to mention that I did the above test without any of the code modifications suggested in this issue.