[wp-trac] [WordPress Trac] #46442: Visual Editors stopped working with WordPress v5.1

[WordPress Trac]

#46442: Visual Editors stopped working with WordPress v5.1
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 Reporter:  burningthumb  |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Editor        |     Version:  5.1
 Severity:  major         |  Resolution:
 Keywords:                |     Focuses:
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Comment (by usmc1):

 I have been running a website on WordPress(then at v5.1) using the theme
 Esteem (v1.4.2) by Theme Grill using Firefox v66.0b13. Two weeks ago I
 started getting a white screen when I try to edit any page. I can’t think
 of any change that might have led to this (e.g. new plug-ins).
 Interestingly, the widget that allows a common block to be displayed on
 all pages was still editable.

 I tried the following, none of which have worked:
 1. cleared my browser cache
 2. deactivated all plug-ins
 3. changed the theme to Twenty Nineteen
 4. reverted to Classic Editor
 4. used Internet Explorer and Edge as alternative browsers
 5. logged in via my mobile using Chrome
 6. called the host support but they cound't find any issues at their end

 Health Checker didn't show up anything untoward.

 I got someone to investigate and it appeared that my host put tracking
 pixel code in too many files – including one called tinymce.min.js. This
 meant that that broke, so he turned the tracking pixel off and after some
 fiddling (not sure what) it worked. It then stopped working again on my
 laptop that evening but by the next day WordPress had been upgraded to
 v5.1.1 and it’s back working.

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Ticket URL: <https://core.trac.wordpress.org/ticket/46442#comment:3>
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