Hi @sam_nazarko and @tanio99 - another bug for you, I’m afraid. 
You might have noticed this thread a little while ago: What the heck is going on here?
I’ve finally figured out what I did that triggered that problem: it was going into the video calibration settings while playing a 3D video. What I was trying to do was just to change the vertical position of the subtitles; but doing that obviously caused all sorts of stuff to be set to the wrong values in ways that couldn’t easily be corrected through the UI.
It’s possible to get things back to normal (I think) by reinstalling the non-3D build and then resetting some stuff to defaults in System settings. But at some point the Video Calibration stuff needs checking in the 3D build.