Sometimes when @vladislavbelov makes changes shaders need to be updated 

I'm on Apple Silicon, not Intel. (And I'm on OS 15.8, which is two versions below the recently released OS 27.) And I'm using the ARM build. I have re-downloaded the app (in the unlikely event that the binary somehow got damaged in such a way that it still runs), and deleted the Cache folder. Are there are parameters or settings I can use in the config file that might be useful?

Do you know if you were using the vulkan or the opengl backend ? you could try running the game from the terminal with -conf:rendererbackend:vulkan or put rendererbackend=vulkan in your user.cfg

I did a search, and ai said that macos 27 dropped hardware support for intel macs, so intel macs can't go to 27. Not being able to run intel apps is going out in macos 28. https://developer.apple.com/news/?id=w5ngl9k2. So, I think @benwiggy is fine

Mac recently dropped support for Intel-based apps, you can either install Rosetta or reinstall from the website using the non-intel version. This may or may not be your problem.