Empty RSS feed when applying a category filter

Hi!
Sorry if this has been addressed before but I haven't found it. Please do point out where if this is the case, and apologies.

Here's the (working) setup:
Two panels on the home page . On the left, stories about the company, on the right news about Apple.

These come from a view applying a filter on the "Story" nodes, with the following path: /panel-category-view/%.
$handler->display->display_options['path'] = 'panel-category-view/%';
contextual filter: Contenu : Catégorie (field_categorie) which is a vocabulary field. One of the vocabulary terms is Apple.

This url works great : http://www.tamsoftware.info/panel-category-view/Apple

From panels, just supply the correct vocabulary term and everything looks great.

What doesn't work: RSS feeds for these same pages.

I created a feed display for this view, it's path is /panel-category-view/%/feed

If I go to http://www.tamsoftware.info/fr//panel-category-view/all/feed I see all the stories
If I go to http://www.tamsoftware.info/fr/panel-category-view/Apple/feed I receive 'No articles'

I probably need to just add a tiny little thing somewhere, but I'm pulling my hair off.

Thanks for any help

Here's the full export

$view = new view;
$view->name = 'panel_category_view';
$view->description = '';
$view->tag = 'default';
$view->base_table = 'node';
$view->human_name = 'Panel_category_view';
$view->core = 7;
$view->api_version = '3.0-alpha1';
$view->disabled = FALSE; /* Edit this to true to make a default view disabled initially */

/* Display: Master */
$handler = $view->new_display('default', 'Master', 'default');
$handler->display->display_options['title'] = '%1';
$handler->display->display_options['use_more_text'] = 'plus';
$handler->display->display_options['access']['type'] = 'none';
$handler->display->display_options['cache']['type'] = 'time';
$handler->display->display_options['cache']['results_lifespan'] = '3600';
$handler->display->display_options['cache']['output_lifespan'] = '3600';
$handler->display->display_options['query']['type'] = 'views_query';
$handler->display->display_options['query']['options']['query_comment'] = FALSE;
$handler->display->display_options['exposed_form']['type'] = 'basic';
$handler->display->display_options['exposed_form']['options']['reset_button_label'] = 'Réinitialiser';
$handler->display->display_options['exposed_form']['options']['exposed_sorts_label'] = 'Trier par';
$handler->display->display_options['pager']['type'] = 'mini';
$handler->display->display_options['pager']['options']['items_per_page'] = '10';
$handler->display->display_options['pager']['options']['offset'] = '0';
$handler->display->display_options['pager']['options']['id'] = '0';
$handler->display->display_options['pager']['options']['expose']['items_per_page_label'] = 'Éléments par page';
$handler->display->display_options['pager']['options']['expose']['items_per_page_options_all'] = 0;
$handler->display->display_options['pager']['options']['expose']['offset_label'] = 'Décalage';
$handler->display->display_options['style_plugin'] = 'list';
$handler->display->display_options['row_plugin'] = 'fields';
$handler->display->display_options['row_options']['hide_empty'] = 0;
$handler->display->display_options['row_options']['default_field_elements'] = 1;
/* Champ: Contenu : Titre */
$handler->display->display_options['fields']['title']['id'] = 'title';
$handler->display->display_options['fields']['title']['table'] = 'node';
$handler->display->display_options['fields']['title']['field'] = 'title';
$handler->display->display_options['fields']['title']['label'] = '';
$handler->display->display_options['fields']['title']['alter']['alter_text'] = 0;
$handler->display->display_options['fields']['title']['alter']['make_link'] = 0;
$handler->display->display_options['fields']['title']['alter']['absolute'] = 0;
$handler->display->display_options['fields']['title']['alter']['word_boundary'] = 0;
$handler->display->display_options['fields']['title']['alter']['ellipsis'] = 0;
$handler->display->display_options['fields']['title']['alter']['strip_tags'] = 0;
$handler->display->display_options['fields']['title']['alter']['trim'] = 0;
$handler->display->display_options['fields']['title']['alter']['html'] = 0;
$handler->display->display_options['fields']['title']['hide_empty'] = 0;
$handler->display->display_options['fields']['title']['empty_zero'] = 0;
$handler->display->display_options['fields']['title']['link_to_node'] = 1;
/* Champ: Contenu : Body */
$handler->display->display_options['fields']['body']['id'] = 'body';
$handler->display->display_options['fields']['body']['table'] = 'field_data_body';
$handler->display->display_options['fields']['body']['field'] = 'body';
$handler->display->display_options['fields']['body']['label'] = '';
$handler->display->display_options['fields']['body']['alter']['alter_text'] = 0;
$handler->display->display_options['fields']['body']['alter']['make_link'] = 0;
$handler->display->display_options['fields']['body']['alter']['absolute'] = 0;
$handler->display->display_options['fields']['body']['alter']['external'] = 0;
$handler->display->display_options['fields']['body']['alter']['replace_spaces'] = 0;
$handler->display->display_options['fields']['body']['alter']['trim_whitespace'] = 0;
$handler->display->display_options['fields']['body']['alter']['nl2br'] = 0;
$handler->display->display_options['fields']['body']['alter']['word_boundary'] = 1;
$handler->display->display_options['fields']['body']['alter']['ellipsis'] = 1;
$handler->display->display_options['fields']['body']['alter']['strip_tags'] = 0;
$handler->display->display_options['fields']['body']['alter']['trim'] = 0;
$handler->display->display_options['fields']['body']['alter']['html'] = 0;
$handler->display->display_options['fields']['body']['element_label_colon'] = FALSE;
$handler->display->display_options['fields']['body']['element_default_classes'] = 0;
$handler->display->display_options['fields']['body']['hide_empty'] = 0;
$handler->display->display_options['fields']['body']['empty_zero'] = 0;
$handler->display->display_options['fields']['body']['hide_alter_empty'] = 0;
$handler->display->display_options['fields']['body']['settings'] = array(
  'trim_length' => '200',
);
$handler->display->display_options['fields']['body']['field_api_classes'] = 0;
/* Critère de tri: Contenu : Date de publication */
$handler->display->display_options['sorts']['created']['id'] = 'created';
$handler->display->display_options['sorts']['created']['table'] = 'node';
$handler->display->display_options['sorts']['created']['field'] = 'created';
$handler->display->display_options['sorts']['created']['order'] = 'DESC';
/* Contextual filter: Contenu : Catégorie (field_categorie) */
$handler->display->display_options['arguments']['field_categorie_tid']['id'] = 'field_categorie_tid';
$handler->display->display_options['arguments']['field_categorie_tid']['table'] = 'field_data_field_categorie';
$handler->display->display_options['arguments']['field_categorie_tid']['field'] = 'field_categorie_tid';
$handler->display->display_options['arguments']['field_categorie_tid']['default_argument_type'] = 'fixed';
$handler->display->display_options['arguments']['field_categorie_tid']['default_argument_skip_url'] = 0;
$handler->display->display_options['arguments']['field_categorie_tid']['summary']['number_of_records'] = '0';
$handler->display->display_options['arguments']['field_categorie_tid']['summary']['format'] = 'default_summary';
$handler->display->display_options['arguments']['field_categorie_tid']['summary_options']['items_per_page'] = '25';
$handler->display->display_options['arguments']['field_categorie_tid']['break_phrase'] = 0;
$handler->display->display_options['arguments']['field_categorie_tid']['not'] = 0;
/* Filter criterion: Contenu : Publié */
$handler->display->display_options['filters']['status']['id'] = 'status';
$handler->display->display_options['filters']['status']['table'] = 'node';
$handler->display->display_options['filters']['status']['field'] = 'status';
$handler->display->display_options['filters']['status']['value'] = 1;
$handler->display->display_options['filters']['status']['group'] = 0;
$handler->display->display_options['filters']['status']['expose']['operator'] = FALSE;
/* Filter criterion: Contenu : Type */
$handler->display->display_options['filters']['type']['id'] = 'type';
$handler->display->display_options['filters']['type']['table'] = 'node';
$handler->display->display_options['filters']['type']['field'] = 'type';
$handler->display->display_options['filters']['type']['value'] = array(
  'story' => 'story',
);

/* Display: Page */
$handler = $view->new_display('page', 'Page', 'page');
$handler->display->display_options['defaults']['arguments'] = FALSE;
/* Contextual filter: Contenu : Catégorie (field_categorie) */
$handler->display->display_options['arguments']['field_categorie_tid']['id'] = 'field_categorie_tid';
$handler->display->display_options['arguments']['field_categorie_tid']['table'] = 'field_data_field_categorie';
$handler->display->display_options['arguments']['field_categorie_tid']['field'] = 'field_categorie_tid';
$handler->display->display_options['arguments']['field_categorie_tid']['title_enable'] = 1;
$handler->display->display_options['arguments']['field_categorie_tid']['title'] = '%1';
$handler->display->display_options['arguments']['field_categorie_tid']['breadcrumb_enable'] = 1;
$handler->display->display_options['arguments']['field_categorie_tid']['breadcrumb'] = '%1';
$handler->display->display_options['arguments']['field_categorie_tid']['default_argument_type'] = 'fixed';
$handler->display->display_options['arguments']['field_categorie_tid']['default_argument_skip_url'] = 0;
$handler->display->display_options['arguments']['field_categorie_tid']['summary']['number_of_records'] = '0';
$handler->display->display_options['arguments']['field_categorie_tid']['summary']['format'] = 'default_summary';
$handler->display->display_options['arguments']['field_categorie_tid']['summary_options']['items_per_page'] = '25';
$handler->display->display_options['arguments']['field_categorie_tid']['specify_validation'] = 1;
$handler->display->display_options['arguments']['field_categorie_tid']['validate']['type'] = 'taxonomy_term';
$handler->display->display_options['arguments']['field_categorie_tid']['validate_options']['vocabularies'] = array(
  'categorie' => 'categorie',
  'vocabulary_1' => 0,
  'vocabulary_2' => 0,
);
$handler->display->display_options['arguments']['field_categorie_tid']['validate_options']['type'] = 'convert';
$handler->display->display_options['arguments']['field_categorie_tid']['validate_options']['transform'] = '1';
$handler->display->display_options['arguments']['field_categorie_tid']['validate']['fail'] = 'empty';
$handler->display->display_options['arguments']['field_categorie_tid']['break_phrase'] = 0;
$handler->display->display_options['arguments']['field_categorie_tid']['not'] = 0;
$handler->display->display_options['path'] = 'panel-category-view/%';

/* Display: Story Pane */
$handler = $view->new_display('panel_pane', 'Story Pane', 'panel_pane_1');
$handler->display->display_options['argument_input'] = array(
  'field_categorie_tid' => array(
    'type' => 'panel',
    'context' => 'string.html_safe',
    'context_optional' => 0,
    'panel' => '0',
    'fixed' => '',
    'label' => 'Contenu : Catégorie (field_categorie)',
  ),
);

/* Display: Flux */
$handler = $view->new_display('feed', 'Flux', 'feed_1');
$handler->display->display_options['pager']['type'] = 'some';
$handler->display->display_options['style_plugin'] = 'rss';
$handler->display->display_options['row_plugin'] = 'node_rss';
$handler->display->display_options['path'] = 'panel-category-view/%/feed';
$handler->display->display_options['displays'] = array(
  'default' => 'default',
  'page' => 'page',
  'panel_pane_1' => 'panel_pane_1',
);
$translatables['panel_category_view'] = array(
  t('Master'),
  t('%1'),
  t('plus'),
  t('Appliquer'),
  t('Réinitialiser'),
  t('Trier par'),
  t('Asc'),
  t('Desc'),
  t('Éléments par page'),
  t('- All -'),
  t('Décalage'),
  t('Tous / Toutes'),
  t('Page'),
  t('Story Pane'),
  t('View panes'),
  t('Flux'),
);