I then tried with Corel Movie Factory 7.0, inserting the VS project file as the 'video' content. I burned it with the default menu chosen by MF. I unchecked the Do Not Convert box, and changed the burning properties to a bitrate of 18 Mbps. Dolby 5.1 was already there by default. But for a 27 second project, it took an unconscionable time to burn -- a little over 18 minutes. However, it burned, and it all plays back properly. The only very strange thing is that despite my having very carefully changed the bitrate to 18 Mbps, it burned with a max bitrate of 16.8 Mbps. And it did that twice (as I tried it again just to be sure).
I am unable to explain why it burned in MF and not in X2 since I thought the burning engine in both was essentially one and the same.
All I can therefore suggest, if you don't have MF 7, is that you try burning in VS again, but using a bitrate of 16.8 Mbps, and see if that makes any difference. For what it is worth, the quality of the high definition AVCHD seemed very good at that rate...
Forgive me if I don't try that now myself but I have had a very long day and must go to bed...
