Thanks @drental,
That was it, yeah, that’s what I kept forgetting what it was and didn’t manage to search the right term! 
So, the instructions for @david_beatrania :
- Open this in chrome: chrome://flags/#ignore-gpu-blocklist
- Set this option to Enabled :
The issue is that Chrome/Firefox/Etc. will blacklist certain hardware/driver combos for using Hardware Accelerated WebGL (which Foundry requires to function), and this is the easiest way to work around that
Note though that you are in this case telling Chrome “ignore acknowledged bugs with Hardware Accelerated WebGL for certain hardware/driver combos”. I don’t suppose you have the ability to update drivers on your Mac OS X though.
I hope that helps.