definitely interesting if you are on 10.8.5 as I don’t see any troubles with both of Viktor’s problems either and I’m on 10.11.4 at work and 10.11.5 (beta) at home. So the age of the Mac driver doesn’t appear to be a problem. Not much help to you Viktor as I don’t have an access to a PC to test.
OpenGL problems are always drivers (or too weak/old a video card) from what I understand though, back in 2015 both the AMD and nVidia drivers did cause C4D problems and there were versions of the drivers PC users had to avoid but the drivers have been updated since (by AMD and nVidia).
What card are you using now Viktor? If you go to Preferences/OpenGL and click on Show OpenGL Capabilities what does it say there?