ad_showthread_firstpost_start troubles with plugin
 

Hi!
I created a plugin with:

Product: Vbulletin
Hook Location: global_start

Plugin PHP Code:
PHP Code:
ob_start();
$variable_name = "xyzabc";
ob_end_clean();

If I use $variable_name in ad_header_logo and other templates it goes but if I put it in ad_showthread_firstpost_start it doesn't go.

How can I fix it?