Thanks for all your help. I can try to answer some of your questions.
Using Memorex DVD-R
I used Sony Vegas 7 to render one Dolby Digital AC3 audio file , and one MPEG2 video file.
Then and used DVD Architect-4 to compile DVD.
The MPEG2 total file size was 1.75G.
The DVD menu screen would come up, and let me choose to play the DVD on some players, but not on all. On some players it didn’t recognize the disc at all. The attempt was made in machines I have and in machines my client has. For both of us sometimes it would bring up the menu screen and sometimes nothing at all, so I sort of ruled out a bad machine.
I am inclined to think bad burner, but wouldn’t that make the disc not play in any machine?
I have created DVD’s in this same machine without problems, which could mean the DVD itself is bad. I am going to try to use a different burner and see if that works.
Thanks for all your help.