[The M.I.P.]

@tassoman:
First try to set the full path to phpAdsNew (instead of a relative one) in the settings of this product, to be sure that inclusion of phpadsnew.inc.php also works, when you're using the templating system in scripts outside of the forum's installation directory.
Also check if your $phpAds_config['url_prefix'] setting in phpAdsNew's config.inc.php is a valid absolute URL (e.g. http://example.com/phpadsnew/).

If this doesn't solve your problems, please be more precise and also post a link to your site (or show relevant parts of code (notably the HTML between <!-- BEGIN/END ad ...--> comments) and screenshots).