In case of artifacts problem just set the “reference Plane” to “No Ruler” in the Screen View,
it should resolve the problem.
Regards.

Is this one of the New ones? I have a 2012 and it been perfectly fine until 16 came along. But I am seeing better stability on High Sierra Beta… although the system itself is buggy Houdini has less issues.

The no rulers solution fixes the viewport problem but not the geometry problem. I find it impossible to select points on my 17 inch late 11 MacBook Pro which makes Houdini unusable. I am also unable to apply the official apple solution which is to buy the latest model. SideFX informed me that it's a problem with the apple drivers. Not really hopeful that we will get a fix, still one can dream.