Following on from Chris' comments about the querystring parameter and how it negates the benefit of using the hosted urls.

The only way I know of thanks to Ian Robinson (http://www.dotnetnuke.com/Resources/B...) is to set the value of this querystring to 0. The following bit of SQL will do this;
UPDATE [HostSettings]
SET SettingValue = 0
Where SettingName = 'CrmVersion'
Remember to test this first on your own DB before using in production.

The downside is that it is all or nothing as I havent found a way to turn this off just for non local URLs

Antony