I've written a module which loads CSS and JS files using the #attached property. This works fine across most themes, but for some themes the files are not loading.

e.g.:

$page['header']['#attached']['css'][] = array(
  'data' => drupal_get_path('module', 'mymodule') . '/css/mymodule_default.css',
  'type' => 'file',
  'options' => array(
    'group' => CSS_THEME,
    'preprocess' => TRUE,
    'every_page' => TRUE, 
  ),
);

As there is very little by way of explanation on #attached (most articles repeat the same stuff) I can't figure out where the problem may lie. Using drupal_add_css() and drupal_add_js() works, but is not recommended for caching reasons, and I prefer to pass settings using attached for this reason.

The #attached properties are showing in the $page array but are not being rendered.

Any help is appreciated.

I've written a module which loads CSS and JS files using the #attached property. This works fine across most themes, but for some themes the files are not loading.

e.g.:

$page['header']['#attached']['css'][] = array(
  'data' => drupal_get_path('module', 'mymodule') . '/css/mymodule_default.css',
  'type' => 'file',
  'options' => array(
    'group' => CSS_THEME,
    'preprocess' => TRUE,
    'every_page' => TRUE, 
  ),
);

As there is very little by way of explanation on #attached (most articles repeat the same stuff) I can't figure out where the problem may lie. Using drupal_add_css() and drupal_add_js() works, but is not recommended for caching reasons, and I prefer to pass settings using attached for this reason.

The #attached properties are showing in the $page array but are not being rendered.

In summary, are there situations when certain themes block the correct rendering of #attached elements that would normally be applied to a render structure by drupal_process_attached()

Any help is appreciated.