When using a CMS_FILELIST its raw data may contain a TITLE token which will prevent the generation of the page title element if the layout contains no token on its own.
This is because of "CMS_FILELIST"; will be replaced by following code:
$fileList = new cContentTypeFilelist('<?xml version="1.0" encoding="utf-8"?>
<style>cms_filelist_style_default.html</style>...', 15, array());
The found title token will be replaced instead of adding a title element before the closing head tag.