Ok, I'm not sure if this is the correct way to do this but I took a look at the plugin for this addon and noticed that the code in the "parse_templates" hook is expecting the "THIS_SCRIPT" variable in the forum index.php file to be set to "index". I modified it to look at the new value I set for the integration ("forum_index") and this seems to allow the sub-forums addon to work.
At the top of the Parse_Templates" Hook there is the following line of code:
PHP Code:
if ($vbulletin->options['cybsfa_enable'] AND (THIS_SCRIPT=='index' OR THIS_SCRIPT=='forumdisplay'))
I changed it to read:
PHP Code:
if ($vbulletin->options['cybsfa_enable'] AND (THIS_SCRIPT=='forum_index' OR THIS_SCRIPT=='forumdisplay'))