dvd2one & subtitles

[dusted]

why is it that sometimes a movie backup created with DVD2one doesn't display the subtitles in a part of the movie where they would normally automatically appear - such as a scene where the speech is another language.

DVDdecryptor in file mode was used to rip, the main movie option in DVD2one, and all english subtitles were selected.

So far the movies in which this has happened in is The Bourne Identity, The Sum of All Fears and Clear & Present Danger.

Any assistance would be greatly appreciated