No text between <!-- google_ad_section_start --> and <!-- google_ad_section_end -->

I am trying hard to figure out why I never see any google ads on my main page of my website (most other pages work).

The main page is basically a list of the three recent blogs created using the views module.
I just looked at the source code for the main page and found that there is no text between the two ad_sense tags:

---

<div class="content clear-block">

    <p>Det skulle simpelthen bare prøves det her, at udvikle en hjemmeside med det mål at skabe rammerne for udveksling af erfaringer og ideer indenfor alle aspekter af lystfiskeri. Ideen er at opbygge viden om grej, metoder, pladser, journaler og meget andet, skabt af og for lystfiskere. De forskellige typer af viden er indbyrdes relateret til hinanden, hvilket giver mulighed for en helt ny form for interaktiv oplevelse af informationer. F.eks.</p>

<!-- google_ad_section_start --><!-- google_ad_section_end -->  </div>

<div class="clear-block">

---

Does anybody know if this could be the reason that I do not see any ads?
Also, should the text of the blog not be between the two tags?

I am using the drupal 6.10 together with adsense module 6.x-1.0.