Thanks, @TheHacker66, perhaps the problem is connected to my using a non-powered DVD-player; I had hoped, however, that since the player works flawlessly on a pi to have at least the same flawlessness on the Vero. But if a powered usb-hub is a guaranteed solution in this case, I would be willing to buy one, I think- but not quite on the off chance.
I think @sam_nazarko is looking at the source of the problem and will undoubtedly be able to advice a work around in due course, or offer a solution.
In the mean time: As I can’t play the DVD’s using the USB-DVD-player directly connected to the USB-port of the Vero, I tried to be “clever” : I connected the DVD-player to the raspberrypi, which does play the DVD’s without problems, and then, on the Vero added that pi, and its DVD, as a source in my Vero-video-library.
When I tried to play the DVD from that source on the Vero, unfortunately, OSMC crashed* .
Is this something which I should report separately?