I have installed QuickTime 6, upgraded it to QT6 Pro, and noticed that some old fullscreen trailers (first 'LOTR' internet preview, 'X-Men' teaser and trailer, 'Mission Impossible 2' trailer and others) are not playing anymore. At the same time more "fresh" fullscreen trailers like 'Enemy at the Gates' or 'Final Fantasy' are playing perfectly with QT6 as well as with QT5. Is it a bug of new QuickTime version?

"Movie Trailers Team" answered that

No, they should all work fine, as we have changed no backward compatibility.

Am I only one who have such problem?