Thank you, Mike, for taking a look and making this attempt to fix the problem. Unfortunately, it doesn’t work in any browser for me. Did you try it yourself using the website URL I provided in Private Data? Does it work for you?

I tried myself a different attempted solution which you can see in functions.php using a FOUC (flash of unstyled content) approach, but that didn’t work either. But maybe that’s a possible worthwhile approach, to somehow make the menu hidden until after all CSS has loaded. I don’t know.

Any other ideas?

Thanks,
Gary