Then I don't know what the problem with my results is. Will try further.
To copy there was no build, just create image from disc. For writing there are no tabs to set name etc, and it did not use the name I gave the iso, and did not prompt, just named DVD REcording.
One thing wondering: When creating my DVD the last thing I recorded (from VHS) I let run until it it just ran out of space and stopped. Any chance that is some kind of overrun that spoils the disc? I even deleted one end title.