Unfortunately I don't think that any previous version is going to make a difference. I've since tried 4.0.5.5 (on yet another machine) and it does the same thing. So now I'm thinking that the cause might be related to something else which is updated on a regular basis, eg; antivirus, anti-spyware, Windows updates, etc.

Unless someone happens to come along with the magic answer (and I've yet to find one on the forum, but I'm still looking), it's going to take me a lot of trial and error (and time) to sort it out. Until then, I'm just using SUPER in the background right now to do this particular conversion.

(I can cope with having to use multiple programs to achieve the desired end, but I bought DVDFab Platinum to simplify the process for other family members.)