it appears that I have to render my composite video/soundtrack first
For many of us, this was always our workflow anyway.

While recognising that many users did their editing then jumped straight into the burning module and using their *project* file instead of a fully rendered video of their project, quite a lot of them also experienced problems of one kind or another... So we had (and indeed still have) something we call the 'recommended workflow' which does things in individual steps, rather than collapsing one or more into a single process. Thus, after editing, our workflow recommends that you first go to Share > Create Video File. Then when that has been produced, you open the burning module -- whether it be DVD Factory 2010 or MF 7 -- to author your disc.
Thank you also for the words about your daughter's ease of use of VS. As you say, always good to hear some positive feedback...
