$vbulletin->options['bburl']
That should do the same as create full url it just places the
vb url on front of the script name.
well granted they may have this in there but it is never full
' . $vbulletin->session->vars['sessionurl'] . '
If it was you would have another issue because you must use a & tag between variables in a url.
Since the cron runs without user interaction what I posted should work fine. You just need to remove the link to this forum in the code which is why I hate
vbseo.