When in camera view a little blotch appears to the right of the render frame, and as soon as anything is done - selecting, moving, adjusting - it quickly grows and blots out the screen. Leaving camera view resets it.
What causes that and how do I fix it?
A benchmark test with Unigine of the graphics card on my system, which is a Geforce GTX 960, went fine. My OS is Ubuntu 16.04.