This is proving to be so frustrating.
I’ve turned cloudflare into development mode, deactivated hummingbird. Made sure the local caching on the server was turned off and yet still the customiser screen is stuck on the large X - powered by theme co screen.
I’ve also allocated more memory to PHP in wpconfig as was suggested in another thread. I’ve tried using different browsers, incognito mode etc.
Any ideas? I’m stumped