I've set this up and have it running on my site -- but when a new user registers they are not getting a copy of the new site.
At first I figured it was because I had cets_blogs_default plugin running as well ... so that has now been deactivated
but every new test site is still using the standard twentyten theme, etc
the template site is here --> http://test.social-mix.com/
I'm a bit unsure now what to do next ... supportive ideas appreciated