array_shift(); The argument should be an array in boost.module on line 3417 and on line 3418.

I see this has changed slightly in dev but I think it will also apply to dev.

The offending code.

  // Handle views
  if ($router_item['page_callback'] == 'views_page') {
    $router_item['page_callback'] = 'view';
    $router_item['page_type'] = array_shift($router_item['page_arguments']);
    $router_item['page_id'] = array_shift($router_item['page_arguments']);
    // See http://drupal.org/node/651798 for the reason why this if is needed
    if (is_array($router_item['page_id'])) {
      $router_item['page_id'] = array_shift($router_item['page_id']);
    }
    return $router_item;
  }

I implemented a workaround by adding the following to the top of the function.

  if (!is_array($router_item['page_arguments'])) {
    $router_item['page_arguments'] = array();
  }