5.5 and Customize feature is gone?

Since update to 5.5, I’m unable to use “customize” under the appearance menu or direct from page view. (therefore I can’t access my custom css either).

All pages show a blank screen under ‘customize’, and top left it says “You are customizing…title”.

Everything underneath that is blank.

I’d rather not revert back to a lower version, but I need to reach my css eventually.

Any ideas where to turn first?

The page I need help with: [log in to see the link]



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