Well I just had the following reply from Xara;


Hi,

This is not a bug, but an improvement over version 7 in it's compatibility to display on mobile devices.
In version 7 how a web page was displayed on a mobile device was dependent on the mobile device and it's browser. In MX it now includes a viewport tag by default which means that the page is displayed at an optimum resolution for the devices resolution, which will vary by device. Currently there is no was to disable this from being included in the export, but in future patch updates this will be provided for those that do not want this enhanced functionality. This viewport tag does not stop you from 'zooming out' on the page, all it does is set the intial viewport to the resolution of the device.