"%/%/%" returning 404

I've set up a view, as per below, which should work with "%/%/%" (year/month/day). However, going to e.g. "2008/08/18" gives me a "page not found". Any hints as to what I could look at would be appreciated, as I'd really like to make my URLs "hackable". :) (It should probably be noted that "Live preview" works exactly as I want it. It's only when I actually try to access the view it messes up.)

$view = new view;
$view->name = 'story_archive';
$view->description = '';
$view->tag = 'archive';
$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', 'Standard', 'default');
$handler->override_option('fields', array(
  'title' => array(
    'id' => 'title',
    'table' => 'node',
    'field' => 'title',
  ),
  'created' => array(
    'id' => 'created',
    'table' => 'node',
    'field' => 'created',
  ),
  'view_node' => array(
    'id' => 'view_node',
    'table' => 'node',
    'field' => 'view_node',
  ),
  'teaser' => array(
    'id' => 'teaser',
    'table' => 'node_revisions',
    'field' => 'teaser',
  ),
  'comment_count' => array(
    'id' => 'comment_count',
    'table' => 'node_comment_statistics',
    'field' => 'comment_count',
  ),
));
$handler->override_option('sorts', array(
  'created' => array(
    'order' => 'DESC',
    'granularity' => 'second',
    'id' => 'created',
    'table' => 'node',
    'field' => 'created',
    'relationship' => 'none',
  ),
));
$handler->override_option('arguments', array(
  'created_year' => array(
    'id' => 'created_year',
    'table' => 'node',
    'field' => 'created_year',
    'validate_type' => 'none',
    'validate_fail' => 'not found',
    'default_argument_type' => 'node',
    'relationship' => 'none',
    'title' => 'Archive » %1',
    'default_action' => 'not found',
    'wildcard' => '',
    'wildcard_substitution' => '',
    'default_options_div_prefix' => '',
    'default_argument_user' => 0,
    'default_argument_fixed' => '',
    'default_argument_php' => '',
    'validate_argument_node_type' => array(
      'page' => 0,
      'story' => 0,
    ),
    'validate_argument_node_access' => 0,
    'validate_argument_nid_type' => 'nid',
    'validate_argument_vocabulary' => array(
      '1' => 0,
      '2' => 0,
    ),
    'validate_argument_type' => 'tid',
    'validate_argument_php' => '',
  ),
  'created_month' => array(
    'id' => 'created_month',
    'table' => 'node',
    'field' => 'created_month',
    'validate_type' => 'none',
    'validate_fail' => 'not found',
    'default_argument_type' => 'fixed',
    'relationship' => 'none',
    'title' => 'Archive » %1 » %2',
    'default_action' => 'not found',
    'wildcard' => '',
    'wildcard_substitution' => '',
    'default_options_div_prefix' => '',
    'default_argument_user' => 0,
    'default_argument_fixed' => '',
    'default_argument_php' => '',
    'validate_argument_node_type' => array(
      'page' => 0,
      'story' => 0,
    ),
    'validate_argument_node_access' => 0,
    'validate_argument_nid_type' => 'nid',
    'validate_argument_vocabulary' => array(
      '1' => 0,
      '2' => 0,
    ),
    'validate_argument_type' => 'tid',
    'validate_argument_php' => '',
  ),
  'created_day' => array(
    'id' => 'created_day',
    'table' => 'node',
    'field' => 'created_day',
    'validate_type' => 'none',
    'validate_fail' => 'not found',
    'default_argument_type' => 'fixed',
    'relationship' => 'none',
    'title' => 'Archive » %1 » %2 » %3',
    'default_action' => 'not found',
    'wildcard' => '',
    'wildcard_substitution' => '',
    'default_options_div_prefix' => '',
    'default_argument_user' => 0,
    'default_argument_fixed' => '',
    'default_argument_php' => '',
    'validate_argument_node_type' => array(
      'page' => 0,
      'story' => 0,
    ),
    'validate_argument_node_access' => 0,
    'validate_argument_nid_type' => 'nid',
    'validate_argument_vocabulary' => array(
      '1' => 0,
      '2' => 0,
    ),
    'validate_argument_type' => 'tid',
    'validate_argument_php' => '',
  ),
));
$handler->override_option('filters', array(
  'promote' => array(
    'operator' => '=',
    'value' => 1,
    'group' => '0',
    'exposed' => FALSE,
    'expose' => array(
      'operator' => FALSE,
      'label' => '',
    ),
    'id' => 'promote',
    'table' => 'node',
    'field' => 'promote',
    'relationship' => 'none',
  ),
  'status_extra' => array(
    'id' => 'status_extra',
    'table' => 'node',
    'field' => 'status_extra',
  ),
  'type' => array(
    'operator' => 'in',
    'value' => array(
      'story' => 'story',
    ),
    'group' => '0',
    'exposed' => FALSE,
    'expose' => array(
      'operator' => 'type_op',
      'label' => 'Indhold: Type',
      'use_operator' => FALSE,
      'identifier' => 'type',
      'remember' => FALSE,
      'single' => TRUE,
      'optional' => TRUE,
      'reduce' => FALSE,
    ),
    'id' => 'type',
    'table' => 'node',
    'field' => 'type',
    'relationship' => 'none',
  ),
));
$handler->override_option('access', array(
  'type' => 'none',
  'role' => array(),
  'perm' => '',
));
$handler->override_option('empty', 'No entries posted during this unit of time.');
$handler->override_option('empty_format', '1');
$handler->override_option('link_display', 'page_2');
$handler->override_option('row_plugin', 'node');
$handler->override_option('row_options', array(
  'teaser' => 1,
  'links' => 1,
));
$handler = $view->new_display('page', 'Månedsvisning', 'page_1');
$handler->override_option('arguments', array(
  'created_year' => array(
    'id' => 'created_year',
    'table' => 'node',
    'field' => 'created_year',
    'validate_type' => 'none',
    'validate_fail' => 'not found',
    'default_argument_type' => 'node',
    'relationship' => 'none',
    'title' => 'Archive » %1',
    'default_action' => 'not found',
    'wildcard' => '',
    'wildcard_substitution' => '',
    'default_options_div_prefix' => '',
    'default_argument_user' => 0,
    'default_argument_fixed' => '',
    'default_argument_php' => '',
    'validate_argument_node_type' => array(
      'page' => 0,
      'story' => 0,
    ),
    'validate_argument_node_access' => 0,
    'validate_argument_nid_type' => 'nid',
    'validate_argument_vocabulary' => array(
      '1' => 0,
      '2' => 0,
    ),
    'validate_argument_type' => 'tid',
    'validate_argument_php' => '',
  ),
  'created_month' => array(
    'id' => 'created_month',
    'table' => 'node',
    'field' => 'created_month',
    'validate_type' => 'none',
    'validate_fail' => 'not found',
    'default_argument_type' => 'fixed',
    'relationship' => 'none',
    'title' => 'Archive » %1 » %2',
    'default_action' => 'not found',
    'wildcard' => '',
    'wildcard_substitution' => '',
    'default_options_div_prefix' => '',
    'default_argument_user' => 0,
    'default_argument_fixed' => '',
    'default_argument_php' => '',
    'validate_argument_node_type' => array(
      'page' => 0,
      'story' => 0,
    ),
    'validate_argument_node_access' => 0,
    'validate_argument_nid_type' => 'nid',
    'validate_argument_vocabulary' => array(
      '1' => 0,
      '2' => 0,
    ),
    'validate_argument_type' => 'tid',
    'validate_argument_php' => '',
  ),
));
$handler->override_option('empty', 'No entries posted this month.');
$handler->override_option('empty_format', '1');
$handler->override_option('path', '%/%');
$handler->override_option('menu', array(
  'type' => 'none',
  'title' => '',
  'weight' => 0,
));
$handler->override_option('tab_options', array(
  'type' => 'none',
  'title' => '',
  'weight' => 0,
));
$handler = $view->new_display('page', 'Årsvisning', 'page_2');
$handler->override_option('arguments', array(
  'created_year' => array(
    'id' => 'created_year',
    'table' => 'node',
    'field' => 'created_year',
    'validate_type' => 'none',
    'validate_fail' => 'not found',
    'default_argument_type' => 'node',
    'relationship' => 'none',
    'title' => 'Archive » %1',
    'default_action' => 'not found',
    'wildcard' => '*',
    'wildcard_substitution' => 'All years',
    'default_options_div_prefix' => '',
    'default_argument_user' => 0,
    'default_argument_fixed' => '',
    'default_argument_php' => '',
    'validate_argument_node_type' => array(
      'page' => 0,
      'story' => 0,
    ),
    'validate_argument_node_access' => 0,
    'validate_argument_nid_type' => 'nid',
    'validate_argument_vocabulary' => array(
      '1' => 0,
      '2' => 0,
    ),
    'validate_argument_type' => 'tid',
    'validate_argument_php' => '',
  ),
));
$handler->override_option('empty', 'No entries posted this year.');
$handler->override_option('empty_format', '1');
$handler->override_option('path', '%');
$handler->override_option('menu', array(
  'type' => 'none',
  'title' => '',
  'weight' => 0,
));
$handler->override_option('tab_options', array(
  'type' => 'none',
  'title' => '',
  'weight' => 0,
));
$handler = $view->new_display('page', 'Dagsvisning', 'page_3');
$handler->override_option('empty', 'No entries posted this day.');
$handler->override_option('empty_format', '1');
$handler->override_option('path', '%/%/%');
$handler->override_option('menu', array(
  'type' => 'none',
  'title' => '',
  'weight' => 0,
));
$handler->override_option('tab_options', array(
  'type' => 'none',
  'title' => '',
  'weight' => 0,
));