What might cause the text editor (CKEditor 5 / TinyMce) not to appear in certain text fields set to use the editor? 

I have several custom blocks that were created early on with CkEditor 4. They work fine, but if I try to edit them (or create new ones) there is no longer a text editor, only the bare text box. Same thing with any summary fields for page/post/or various content types, even though the summary fields are set to one of the html formats.

The same is true for comments, whether logged in or out. 

None of the body fields in various content types have this issue.

I realize this could be caused by any number of variables, but would appreciate any ideas on where to look.  I have checked through permissions and have tried changing text formats and even editors, but the issue remains. 

 Here's the add a custom block form set to use filtered html. The CKEditor toolbar doesn't show:

 

 

 

Most helpful answers

Could be a JavaScript error. You could inspect the page (right click on the page and select Inspect - something named like that) and see if there are errors on the console tab. Might provide a clue.

Comments

Could be a JavaScript error. You could inspect the page (right click on the page and select Inspect - something named like that) and see if there are errors on the console tab. Might provide a clue.

That did it!

Some time ago, I had added the CKEditor inline image styles module. and hadn't noticed any changes until recently.

I disabled it and then was able to use CKEditor in the block text field.

Summary fields still only show as text, but I can live with that. (would still fix it if I knew why though.)

Thanks for the quick help!

Dan

These were the errors I found:

The CKEditor instance could not be initialized. js_7KVMdDKhgljB_r26yHvuWcqYpOALqjuaFRooptnmwiA.js:1825:19

    attach https://SITENAME.com/files/js/js_7KVMdDKhgljB_r26yHvuWcqYpOALqjuaFRooptn...
 

TypeError: Backdrop.settings.ckeditor_inline_image_style is undefined

    _injectCustomCss https://SITENAME.com/files/js/js_7KVMdDKhgljB_r26yHvuWcqYpOALqjuaFRooptn...
 

TypeError: Backdrop.settings.ckeditor_inline_image_style is undefined

    _injectCustomCss https://SITENAME.com/files/js/js_7KVMdDKhgljB_r26yHvuWcqYpOALqjuaFRooptn...
 

The summary never shows rich text, so that part isn't broken. Glad you figured out the other part.

I would not have thought to look at the browser console - learning slowly here.