OK, tried again with NXT4, using a Verbatim blank DVD, very careful to select CREATE DVD, then clicked the big red BURN button, it seemed to do its thing.
When done, DVD player refused it, ground a wee bit, then spit it back out.
Looked at it with File Explorer, same two files, AUDIO and VIDEO TS.
When I put the disk into the computer, ground a wee bit, then gave an error window Big Red with X in the middle, with I: Application not found. My DVD drive is DVD RW (I:)
I am not knowledgeable enough to fully understand what is transpiring, but it appears to me there is something in the software that is supposed to tell the DVD player the disk contains a movie, and the DVD player then responds with actions to play the movie. Either that code is missing in the software (unlikely) or it is not getting encoded on the disk.
My next step, failing other suggestions from you, is to take the new copy of NXT 6 when it arrives, along with the authored files I have created, to my local computer shop where I have friends, load the software onto one of their machines, then try to create a DVD movie and see what happens.
Should be quite a journey. I will take two computers (an HP and a Dell), the DVD player, and a flash drive with Vegas authored videos in several formats.
ANY suggestions appreciated. Or, in lieu of suggestions, maybe a prayer? :-)