I think I see where the problem is. I've just checked the file sizes and content of the admin/includes/classes/order.php and the includes/classes/order.php file and it seems they are reversed on my test install. This was supposed to be a clean install from BlueHost, and now I'm wondering what else could possibly be wrong - although the test store does seem to be working with out any problems - although I haven't created an order yet ;-)