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This is one of a long list of similar errors on the Widget page:
The “custom_html” block was affected by errors and may not function properly. Check the developer tools for more details.
The item in quotes includes: meta, text block, media, etc.
I have two websites, was using Customizr, the preview for the template is blank, on both sites.
Officewife.biz has more errors in widgets than Aspiritualparadigm.com Using the same widgets on both sites.
Used the troubleshooter, turned off all plugins, widget errors stayed the same.
Changed the theme. Errors are the same.
Ran WordPress Doctor, core files check failed on both sites.
Ran out of suggestions and steps to try.