I'm looking for a way to change the theme thats used when a new blog is created on my wordpress mu install. I've tried the blog-defaults.php plugin that I've seen floating around but installing / activating it didn't seem to do anything or create any new options on my dashboard. Is there something I need to edit manually in the .php file?
I've also tried renaming "mytheme" folder to "default" - but it seems to break the theme I'm trying to use.