There should be more obvious highlighting in the browser for component activation. It should always be very clear to a user when a component is activated. I think the basic problem is that the radio button is not visible unless you have moused over the component in the browser- if that, or a check mark, were located to the left of the component name, and always visible if active, it would save confusion.
This would particularly help those just coming to Fusion. Component activation is a frequent stumbling block, and there are no clear visual cues in the UI for this important status. Making the activation status more obvious- since some component is always activated- would help a good deal.
Ron