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Hi,
I updated from version 1.10 to 1.12 and it has caused an error with a Custom Post Type with custom fields. The TinyMCE editor does not load and I cannot switch between the Text tab and the Visual tab. The console gives the error “Uncaught TypeError: Cannot read property ‘external_plugins’ of undefined” and references the file /wp-content/plugins/wp-image-zoooom/assets/js/tinyMCE-button.js?wp-mce-4506-20170408 on line 4. And also references wp-includes/js/tinymce/tinymce.min.js.
It’s obviously conflicting with the WordPress TinyMCE editor.