the reason you cant see it when logged in is because of:
http://www.wikidot.com/forum/t-100815/showing-adsense-ads-to-anonymous-users-only#post-297049
enabling ads for everyone in site manager will enable you to see the code in view source.
this is from the source from the shriven site:-
<a href="http://schrijven.wikidot.com/nodig-je-vrienden-uit">http://schrijven.wikidot.com/nodig-je-vrienden-uit</a></p>
</div>
<div style="display:block; float: none; visibility:visible; margin: 10px auto; text-align: center;">
<script type="text/javascript"><!--
google_ad_client="pub-8344687844494012";
google_ad_host="pub-8290351116363959";
google_alternate_ad_url="http://www.wikidot.com/default..flow/adsense__T468x60/bg/FFFFFF/tit/0000FF/txt/000000/url/008000/bo/FFFFFF";
google_ad_width=468;
google_ad_height=60;
google_ad_format="468x60_as";
google_ad_type="text_image";
google_color_border="FFFFFF";
google_color_bg="FFFFFF";
google_color_link="0000FF";
google_color_url="008000";
google_color_text="000000";
//--></script>
<script type="text/javascript"
src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
</script>
</div>
<div class="page-tags">
so as i see it IS there, and it matches the code on one of my sites.
a few days ago i clicked on a number of pages on the shriven site, as its against the terms and conditions i did not click on any ads, (as true as i am sitting here riding my bike) and i am now wondering if it does not register clicks from logged on wikidot members!!!
There is only one way one testing this…
and i am now doing it :-)