This is a great question and I am anxious to read the answer.
I wonder how your file structure is set up.
Do you have a folder that has the name of a movie in DVD format, then have two subfiles, audio_ts and video_ts ?
Do you have several VOB files in the video_ts folder ??
Also, there should be two IFO files inside the video_ts folder, do you have two ?
I wonder if the selection of the IFO file, will play the entire video and that if there are several VOB files, it might be allowing for an individual to be played, rather than the entire video.
Jon