From the comments, problems seems to be related to some plugin misbehaving.
Related Posts:
- When switching from html to visual editor the tag gets corrupted
- Markup of oEmbed codes in the editor?
- How can I stop TinyMCE from converting my HTML entities to characters?
- Add Shortcode inline inside Gutenberg block
- TinyMCE editor – new lines not rendered on front end
- WordPress tinymce prints empty P tag and break html format
- WP 3.3 my rich text category editor toolbar is gone!
- Add table controls with wp_editor minimal editor configuration (‘teeny’)
- TinyMCE Plugin Parameter
- Add table button in editor without Plugin
- Our shortcode dropdown box in Tinymce is not working in WordPress 3.9?
- Custom TinyMCE style formats disabled
- Add buttons to the new TinyMCE WP Editor. Javascript API
- Is it possible to disable the image alignment options in the post editor?
- How to dynamically generate wordpress editor on frontend?
- Change syntax styling of TinyMCE HTML Text Editor
- More than one TinyMCE (wp_editor) with different $settings[‘drag_drop_upload’] values breaks
- Why is the media upload button not in the main toolbar & can it be placed there instead?
- Adding CSS to admin TinyMCE editor for custom button
- How can a TinyMCE modal return formatted/visual text?
- Allowing style tag in TinyMCE editor
- TinyMCE Advances is removing blanks (” “)
- Why Editor reformats my code
- enable TinyMCE for comment forms
- Best Browser for Editing Posts
- TinyMCE strips off the href tag inside span, if i change from text to visual
- Adding a Media Button to the WordPress Content Editor
- Wordpres Tinymce custom button (Gavick guide)
- Error in backend: Failed to load plugin: tabfocus from url
- Preserve indentation, HTML5 shorthand in editor
- `tinyMCE is not defined` after migrating site to server
- Custom shortcode editor [BackboneJS & TinyMCE)
- How do I separate my theme’s styles from editor styles?
- Problem with Line spacing in wysiwyg editor in WP 3.5.1
- Remove HTML editor and visual/HTML tabs from TinyMCE
- Initialize TinyMCE editor / visual editor after AJAX insert
- No filter of code on switch from html to visual editor, how?
- How to include own css on wordpress tinymce editor?
- How to keep non-breaking spaces in the visual editor?
- Remove “Are You Sure” dialogue when leaving editor
- Creating a custom MCE view for your shortcodes [closed]
- How to customize the symbols that appear in the Visual Editor insert custom character
- How to make WordPress and TinyMCE accept tags wrapping block-level elements as allowed in HTML5?
- TinyMCE Autoresize
- Disable TinyMCE autoformatting
- Visual Editor freezing on text highlight since 4.3
- Remove ‘Visual’ tab from TinyMCE editor
- tinyMCE.activeEditor = null WP editor loaded in ‘Text’ mode?
- Keep pasted pre formatted code as it is -with tabs- in visual editor
- Text cut off after the character 𪇆 in TinyMCE
- Insert text a cursor position in to TinyMCE text editor
- Using main style.css with add_editor_style
- Access tinymce from thickbox
- WYSIWYG editor in WP 3.2 plugin
- How can I troubleshoot why TinyMCE won’t load custom plugins in the visual editor?
- TinyMCE Editor as component in Gutenberg Block
- Add WYSIWYG to Image Description field
- wp_editor on input changes content
- Set tinymce direction to rtl
- Add a select a class dropdown in tinymce
- WordPress & TinyMCE: Failed to load
- How do I add a TinyMCE row that all users can see, instead of just admins?
- How to disable formatting
- How to get line breaks to translate to paragraphs?
- Localize variables with TinyMCE script
- Shift-Enter in tinyMCE (wp 3.3.1) not working
- TInyMCE object Tag stripped
- WordPress Tinymce editor broken and nothing seems to fix it :(
- Visual editor not showing all table rows
- Adding custom styles to elements, without creating new elements
- How to customize the “Insert/edit link” popup box?
- customize tiny MCE blockqute
- allowing all HTML tags in tinymce editor
- tiny_mce_before_init is not trigger
- Save WYSIWYG editor plugin settings, only works after second save
- Front-end image upload from TinyME [closed]
- Embed iFrame in WordPress 3.0.1
- How to add custom ‘layout’ buttons to wordpress editor?
- TinyMCE: Move buttons from 2nd row to top row
- Send data to Editor before saving the post
- Change the background of the TinyMCE editor with available WP arguments
- When I write posts I usually have to use non breaking space element in order to keep margins in between the sentences. why?
- TinyMCE doesn’t work correctly in the Media Modal Window
- Add custom value for link_class_list for the classic editor
- Loading a self-hosted custom @font-face into TinyMCE dropdowns (Classic Editor) via ‘tiny_mce_before_init’ filter
- tinymce and responsive line-breaks (short words after a period)
- Client on iPad accidentally adding tag to posts while writing
- Add custom TinyMCE 4 Button: Is it mandatory to have one JS per button?
- Visual Editor not working properly
- wp_editor Too Tall when Content is Loaded
- TinyMCE HTML Encode Backslash
- Revealing ‘code’ hidden button in TinyMCE4 and WordPress 3.9.x
- TinyMCE 4.0: specifying buttons to display [duplicate]
- regEx wp core file
- Adding New Row of Custom TinyMCE
- Using TinyMCE fiddle for node filter to add id attribute to anchors
- WYSIWYG with HTML source?
- WordPress and TinyMCE Advanced: Failed to load javascript
- add button to tinymce
- install tinymce plugin [closed]