It looks like the google analytics tracking JS is missing from the homepage -- maybe it's only been included for pages that show up after log in?

Please ensure google analytics tracking JS is in the global site nav:

<script type="text/javascript">
var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www.");
document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E"));
</script>
<script type="text/javascript">
try{
var pageTracker = _gat._getTracker("UA-5090821");
pageTracker._trackPageview();
} catch(err) {}</script>


(taken from http://code.google.com/apis/analytics/docs/tracking/gaTrackingOverview.html )