[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         |   Keywords:
  Focuses:                |
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 When I upgraded to WordPress v5.1 both the classic and gutenberg visual
 editors stopped working.  In the classic editor I would get no buttons, a
 tinyMCE not found error in the browser console, and a blank edit area.  In
 Gutenberg I would get a completely blank screen, there was also JS console
 errors for undefined symbols.  In both cases I could click and drag to see
 the text was there but was white.

 I was saved by the WP Downgrade plugin which I used to downgrade from v5.1
 back to v5.0.3 where the visual editors are working again.

 I worked on this for almost 3 days.  Very, very, annoying.

 As a test,  I reinstalled v5.1 and the editors stop working, then I rolled
 back to v5.0.3 and they start working again.  Its repeatable at will.

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