TL DR: Read Update 3
This error occurs when I leave or enter the Scene tab with the mouse cursor. It occurs in any project of any size since Unity version 5.4, and now even with 5.5.
This error won’t happen if Scene tab’s shading mode is wireframe, it must be set to shaded. Game tab works fine. Also I noticed that HDR must be turned on in the camera component. I turned off the Post Process Behavior on the camera, but it didn’t help.
Editor is 64bit on a 8GB machine with i5 6600. Editor takes up to ~700MB RAM for current project. I updated the driver for my GTX970 (376.33) with cleared control panel settings. Also tested on a single 1080p and 4K monitor, but it’s the same problem. Solving this with a hammer by reinstalling Windows 10 doesn’t work either.
A simple way of reproducing this error on my machine, is to create a new project and import the Adam Interior Environment from the asset store. I’m using this computer also for gaming and other tools. Only Unity is causing such problems.