11 days ago - AndrewT - Direct link
Commander_A said: I'm attempting to get a full refund as this isn't mentioned in their store page's minimum requirements to run the game.
    • OS: Mojave (MAC OS X 10.14)
    • Processor: Intel® Core™ i7-7820HQ
    • Memory: 12 GB RAM
    • Graphics: AMD® Radeon™ PRO 560 (4 GB)
As Intel video is not mentioned it is, and always was, unsupported for the MacOS version of the game, regardless of the renderer in use. It's a sheer matter of luck that it ever worked in fact!  
3 days ago - AndrewT - Direct link
Jhofstetter said: I do have a Mac with an Intel processor, even with an i7 core just as mentioned in the game requirements. So the problem would be that my graphics are also Intel?
That is exactly the issue, I'm afraid!

As mentioned above, support for openGL was removed in recent patches for this game and Vic3, which means they will no longer run on that unsupported hardware.

All you can do is revert to the previous 1.10.2 version in the Steam betas tab, or play on some other machine that meets the hardware specs. Also, if you have Apple Bootcamp installed it will probably work there.  
about 22 hours ago - AndrewT - Direct link
Jhofstetter said: I do still wonder though if there was a warning for these Mac players that I've missed

Deprecation of OpenGL Support for MacOS and Linux

Hello everyone! We're announcing today that with the release of Wards & Wardens, Crusader Kings III will no longer support the OpenGL renderer on MacOS and Linux as we shift our focus towards better support for the Vulkan rendering API. OpenGL... forum.paradoxplaza.com forum.paradoxplaza.com
Jhofstetter said: By the way, I assume newer beta versions will be available over time on steam? At the moment the latest I can play on is 1.9.2
1.10.2 is definitely there. Steam put them in alpha order, not numerical order.