Just installed Hyperpixel 4 touch on Raspberry Pi 3 B. I’m running Kaffeine to display video from WinTV USB device but the video display is being truncated on the right, losing about half the video screen. The rest of the window around the video displays fine. The Kaffeine display was fine going to hdmi out before I installed Hyperpixel.
It turns out the problem is with the VLC display software, not Kaffeine. VLC viewer has the same truncation problem.