I am having a strange problem with the Vero 4k+ which I have never had before.
I was using an RPi3 with Libreelec before with the same files.
Whenever I start to play a 3D movie (no matter if Top-and-Bottom, Side-by-Side or an .iso) after a few seconds the top of screen gets darker than the rest. (It’s between 5-10% percent of the screen). Not such a problem in movies with letterbox bars but very distracting in full screen movies like Avatar.
Also sometimes the top half of the screen flickers during playing a 3D movie.
When I go to system settings while playing the movie and play around with the hardware acceleration or the resolution options, the top returns to normal brightness until after a few seconds or even a minute it gets darker again.
Sorry for not being more specific but this is really hard to explain.
What could it be and what can I do?