In order to display ads to logged in members the Adsense Crawler needs authentication (the crawler needs access via a login as explained in Adsense tutorials).
To clarify, is IPS Forums setup to allow Google Adsense Crawler, thus does it have the ability to allow adsense to show to logged in members?
Having the ability to show Adsense ads to our members should be out of the box, wouldn't everyone agree?
@Sonya* explains this further.