I have this problem. If I create a new post the editor opens but with some small corruption in the top left. The title bar accepts characters but does not display them. The title bar disappears when I click on the text box. The text box will accept characters but if I click on any formatting button (link, preview etc) I get a blank page with no way to back to the post .
I get no failure messages and the post will save in draft .
I’ve seen lost of references to JavaScript for this problem but I’ve tried various browsers and the results are the same.