macOS 15.7.4 (Intel): App is entirely white, only shows interface shortly #27

When I start the app, it shortly shows the interface (maybe less than a second), then it's entirely white:

I can right-click and select Reload, then I see the interface again, but again only for a fraction of a second (just long enough to take the screenshot with good timing), before it turns white again.

I can also right-click and select Inspect Element, then I see that "An uncoverable error has occured" and "failed to create shader":