When browsing to /default.aspx?GroupKeys=root I get a Group Not Found message. The same happens on the telligent site telligent.com. When trying this with other groups it works fine.
What I am trying to do is use a different theme on the home page of the site. I wanted to make those theme changes against the Site Root group and then set that group on the home page by adjusting the SiteUrls.config file.
If this cant be fixed then I have the fallback option of creating a new group just for the home page and then modify SiteUrls.config to use that group instead. Ideally it would be the Site Root so I can then drop widgets on to the page and set them to get the data from child groups which I would not be able to do with a new group.