Page: /wp-admin/admin.php?page=newsletter_emails_composer
I have the same problem. All buttons in the newsletter editor aren’t working, except for the preview button, which generates an empty field. After clicking a button, the WP menus also stop working. So it’s definitely a JavaScript error that I haven’t found yet.
All other plugins have also been updated.
However, the console doesn’t display any errors, which makes things difficult.
It also looks like tinymce isn’t loading at all. There should be an editor field below the buttons, but it isn’t there.
Okay, I’ll wait and see if a solution is found.