Visits not shown (no replies)

Hi,

I have 4 websites, all on the same server in different pathes. I've installed the latest Piwik yesterday in another path.
I'm using Joomla, so I've installed the Plug-In and added the tracking code (with the noscipt version without bots:

<!-- Piwik -->
<script type="text/javascript">
  var _paq = _paq || [];
  _paq.push(["trackPageView"]);
  _paq.push(["enableLinkTracking"]);

  (function() {
    var u=(("https:" == document.location.protocol) ? "https" : "http") + "://analytics.familie-voelker.de/";
    _paq.push(["setTrackerUrl", u+"piwik.php"]);
    _paq.push(["setSiteId", "1"]);
    var d=document, g=d.createElement("script"), s=d.getElementsByTagName("script")[0]; g.type="text/javascript";
    g.defer=true; g.async=true; g.src=u+"piwik.js"; s.parentNode.insertBefore(g,s);
  })();
</script>
<!-- End Piwik Code -->
<!-- Piwik Image Tracker -->
<noscript>
<?php
if (preg_match('/bot|crawl|slurp|spider/i', $_SERVER['HTTP_USER_AGENT'])) {
//do not fire tracker  
}
  else {?>
<!-- Piwik Image Tracker -->
<img src="http://analytics.familie-voelker.de/piwik.php?&idsite=1&amp;rec=1&urlref&_cvar={&quot;5&quot;:[&quot;Non Bot&quot;,&quot;No Javascript&quot;]}" style="border:0" alt="" />
<!-- End Piwik -->
 <?php }?>
</noscript>
<!-- End Piwik -->

The code is vsible on all 4 websites:
http://www.familie-voelker.de/
http://www.foto-voelker.de/
http://www.hessheim.de/
http://kiga.hessheim.de/

Yesterday I did some tests with one website an I'm able to see the visits in the dashboard. I can see 4 visits for another site, too.
But 2 don't show any visits.
Ok... Maybe really nobody visited them, so I asked some friends to vistit the sites. Under visitors -> visitor logs I can see the visits. I've set "Allow Piwik archiving to trigger when reports are viewed from the browser" to yes.

I've read the FAQ but didn't find any other hints....

Does anybody have an idea?