Initialize the $_GET['q'] variable to the proper normal path.
function drupal_path_initialize() {
// Ensure $_GET['q'] is set before calling drupal_normal_path(), to support
// path caching with hook_url_inbound_alter().
if (empty($_GET['q'])) {
$_GET['q'] = variable_get('site_frontpage', 'node');
}
$_GET['q'] = drupal_get_normal_path($_GET['q']);
}