Plugin does not work in vbCMS

[marrr]

Description: Plugin grabs extra header and footer code and stores it in a hook to be called when the header and footer templates are rendered.
Hook: global_start

PHP Code:

require_once('../includes/Smarty/Smarty.class.php'); 
require_once('../includes/functions.php'); 
require_once('../includes/vars.inc.php'); 
$tpl = new Smarty(); 
$tpl->template_dir = '**REMOVED**'; 
$tpl->compile_dir  = '**REMOVED**'; 
$tpl->config_dir   = '**REMOVED**'; 
$tpl->cache_dir    = '**REMOVED**'; 
load_language(); 
    
ob_start();
show_header(true);
$template_hook['header_extra'] = ob_get_contents();
ob_end_clean();
    
ob_start();
show_footer(true);
$template_hook['footer_extra'] = ob_get_contents();
ob_end_clean(); 


This plugin works everywhere (forums, vbgallery, blog) in the site except on the cms (home) page. My guess is that the global_start hook is not executed when accessing the cms pages. What hook should I be using and should any of the code be modified?