Adding To View Path - Not Picking Up Templates?

So, I'm adding a secondary template location to ActionController's view_paths so that I can dynamically choose the render path (basic 'theme' support).

I can see that ActionController::Base.view_paths contains my new path before the default path but I can't ever seem to render the template in my path. I have a template in both the default and new locations and the default is always rendered. If I remove it, I get an assert_template_exists error.

I must be missing something about how Rails 2 chooses its templates. Ideally it would use the template in the new location if it exists and if not, fail over to the default location.

Any pointers?