Google custom search not working (Drupal in Spanish)

Hello,
I've installed a block with adsense module google custom search, but it is not working. Search always returns no results, and even google adsense reports my custom search as inactive. When I built a custom block with the code I got from google adsense page, it reported as active (and search worked)... I'm using drupal 6.9 in Spanish language, and the latest non-devel adsense module. Here is the code google adsense page tells me:

-----begin of google code----

<form action="http://www.google.es/cse" id="cse-search-box">
  <div>
    <input type="hidden" name="cx" value="partner-pub-xxxxxxxxxxxxxxxx:yyyyyyyyyyy" />
    <input type="hidden" name="ie" value="ISO-8859-1" />
    <input type="text" name="q" size="28" />
    <input type="submit" name="sa" value="Buscar" />
  </div>
</form>
<script type="text/javascript" src="/cse/brand?form=cse-search-box&amp;lang=es"></script>

-----end of google code----

This is the one drupal adsense module generates:

-----begin of adsense module code----

    <div class="content"><div class='adsense adsense_cse'>
<form action="http://empresarialesuned.com/adsense/cse" id="cse-search-box">
  <div>
    <input type="hidden" name="cx" value="partner-pub-xxxxxxxxxxxxxxxx:yyyyyyyyyyy" />
    <input type="hidden" name="cof" value="FORID:9" />
    <input type="hidden" name="ie" value="ISO-8859-1" />
    <input type="text" name="as_q" size="28" />
    <input type="submit" name="sa" value="Buscar" />
  </div>

</form>
<script type="text/javascript" src="http://empresarialesuned.com/modules/adsense/cse/adsense_cse.js"></script>
</div></div>

-----end of adsense module code----

Of course, partner id is the same in both cases (I've replaced it with x/y for no reason, really).
Any ideas about the issue?
Thanks so much!