Change the last line in /path/to/geeklog/public_html/admin/index.php, which currently reads
COM_refresh($_CONF['site_url'] . '/admin/moderation.php');
to
print COM_refresh($_CONF['site_url'] . '/admin/moderation.php');
i.e. just add a "print" command in front of it. That should do the trick.
bye, Dirk