Template hook prob

[soniceffect]

Hi guys,
I am just having a play at trying to modify vbulletin. For a first play about I want to try and hook into the templates.

I have used the following in the process_templates_complete hook location as I want the code to be executed on all areas of the forum in the header. Now I couldnt get it to work in the header, so I moved which template hook I was using and it worked. I dont understand why, please could someone let me know what I am doing wrong


This code works fine.

PHP Code:

$templater = vB_Template::create('SonicModbar_MainBar');
$templater->register('smb',$smb);  
$template_hook['forumhome_above_forums'] .= $templater->render(); 


However it's not working when I change the hook I am using

PHP Code:

$templater = vB_Template::create('SonicModbar_MainBar');
$templater->register('smb',$smb);  
$template_hook['header_userinfo'] .= $templater->render(); 


Help!!! LOL ... Im going insain


The template btw is called SonicModbar_MainBar and simply contains the words "Blah blah blah" so there is nothing detailed in there.