I am using multisite at http://www.the4propertygroup.co.uk.
I have installed the WPMU domain mapping tool.
My problem is that although both the www and non-www versions of the4propertygroup.co.uk display the site, on the sites within my network, such as flatmates4london.co.uk, ONLY the non-www version works. If you type in http://www.flatmates4london.co.uk - you see the registrars holding page.
Can anyone tell me if this an issue with the plugin, WP or my DNS and what I can do to solve it.