New router breaks xAP

I've just upgraded my broadband connection to a fibre connection which involved getting a new router. I've been obliged to use a  different ip set up and most things seem to be working, but I seem to be missing something about the xAP set up.

My currentcost meter is connected and producing data which is being successfully uploaded to xively/cosm/pachube but it is not producing any xAP messages when viewed through XFX viewer. I assume that there must be something which needs the ip address of the box but I can't seem to find what it is. Any pointers would be gratefully received.

Allan