Oka...y I checked and there is apparently an updated Mac version available.

The notes say 11.3.818 - Released 2020-06-07 and mine 11.3.740

So I downloaded the latest version (or so I thought).

I ran the installer and my version is still 11.3.740 and it has overwritten/reset all my preferences.

I am rather peeved about this.

Can anyone tell me what has wrongly been overwritten so I can try and get it back?

At least running the installer has fixed the grey/blank render problem it seems.

Is there an installer for 11.3.818 anywhere?