In v1.5.1, even though the ckeditor plugin package says you don't need to upload the customized /renamed-admin-folder/includes/init_includes/init_html_editor.php file from the zip, the *original* one that comes with v1.5.1 *does* need to still be on your server. If you've removed it or if it's damaged, then it needs to be put back. And if you have another init_html_editor.php file in the init_includes/overrides/ folder, you need to remove it.
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