[xlguy]

If you want the ad to appear twice in a thread then you just need to edit the plugin code, Google Adsense Postbit Integration > postbit_display_complete find this bit of code

PHP Code:

if ($post[postcount] % $vbulletin->options[maxposts] == $google_sira and !$GLOBALS['vbulletin']->GPC['ajax'])
{
eval('$template_hook[postbit_end] .= "' . fetch_template('gaip_code1') . '";');
} 


and add below this code (editing 19 to your choice)...

PHP Code:

if ($post[postcount] % $vbulletin->options[maxposts] == 19 and !$GLOBALS['vbulletin']->GPC['ajax'])
{
eval('$template_hook[postbit_end] .= "' . fetch_template('gaip_code1') . '";');
} 


That would, in our case, add it after the 19th post as well as the one specified in the options section. Obviously this is a bit of an ugly solution, as you have to hard code in the post number (but it works on all pages, i.e. the 19th post on each page not just the first one) but I hope it helps others.