I would now say that two Sony DVD-Rs that I tried must be defective. They verified but nothing is detected on them.
Then all the others I tried, TDK DVD-R and Verbatim DVD-RW, were detected as DVDs, but strange trouble reading at end and detecting times of segments. On DVD+RW burn the times are properly detected but something is wrong at the end too. It does make some difference if I use a + disc.
Could try a different iso builder and burner drive.
PS: What I notice now is that play problems exist at the indexes/chapters which I created after filling the disc.
There's a difference in the way sal player and computer players handle it.
I now plan to use + discs if original is +.
Edited by GeoS, 04 July 2016 - 03:51 AM.