Thanks for the help.... but here's the problem:
Using version 5, any of the video decoders will produce video inside the DVDFab preview video area. When using version 6, the DVDFab decoder produces no video at all, the other decoders will produce video except within their own window titled "ACTIVEMOVIE WINDOW". It's a large window and covers up much of the program area. When set to "INTERNAL", the DVDFab preview area has video... the audio is gone.