[Radiant] Pulling my hairs because of the archive behavior

[Maurizio Balestrieri]

Hi. I'm not able to make the archive behavior monthly index page working :(
I've the following content on the monthly index page:

<r:archive:children:each order="desc">
<div class="entry">
  <p><small><r:date format="%b %d, %Y" /></small></p>
  <h3><r:link /></h3>
  <r:content />
  <r:if_content part="extended">
    <r:link anchor="extended">Continue Reading &#8230;</r:link>
  </r:if_content>
</div>
</r:archive:children:each>

but the above content fails to render the expected list of pages for
the month. I've two entries for September 2, both child of the
"/en/bioenergy-monitor/" archive (behavior) page, which works as
expected since it provides all articles with the proper url: (for
example) "/en/bioenergy-monitor/2006/09/02/my-article/"

I've looked several times at the demo blog content and structure, but
it seems all is OK.

Does anybody have an idea to help?

Is there something specific I've to look at? Debugging how?

Many thanks in advance.

--M