Seems I have a similar problem to the one here:
But I thought it was better to create a new thread.
I am hosting 3 sites on the same server and all 3 have Visitor maps installed. However on 1 of the 3, Visitor Maps plugin has never worked. It's been up for a long time now but has never had a single visitor according to Visitor Maps. Even when I test from different locations.
Ive checked header.php as per the other thread and it does contain: '<?php wp_head(); ?>'
Do you have any suggestions on how to troubleshoot?