I uninstalled the old version I had, and installed 1.3.1. First the cron was not created, so I created it myself. Secondly, the psistats.php comes up fine, but the only thing that is actually being updated is Style Usage, General and Top Threads & Forums. The others do not work. I also ran the cron manually to see if that would update the non working sections and they still come up with no results:
http://linuxgangster.org/forums/psistats.php