I work for a university, and I have a Wordpress MU installation I'm trying to get ready which will host research blogs for my department.
I want the blogs to have the same template as the rest of the site, so I created a Wordpress theme based on that template. It works fine, and so in the Site Admin, I made it the only active theme. However, when a new blog is created, it uses the Wordpress MU Default theme, and I have to manually change it each time.
How do I make my custom theme the default theme so that I don't have to manually change the theme for each new blog?