Users are unable to save layout status

Hi, first of all thank you for the module, i'm trying to use it, but in my case users are unable to save layout status, layout never changes and $form_state['values']['blocks'] is always empty!

function homebox_save_form_submit($form, &$form_state) {
  parse_str($form_state['values']['blocks'], $blocks);
  dpm($form_state['values']['blocks']); // THIS VARIABLE IS ALWAYS EMPTY!!
  foreach ($blocks as $key => $value) {
    parse_str($value, $block);
    $blocks[$key] = $block;
  }
  _homebox_save_user_settings($form_state['values']['page'], $blocks);
}

i've created only a simple homebox page with three blocks "powered by drupal","logo" and "who's online".

thanks in advice