Editor Blank or Frozen After a Core or Plugin Update
The edit screen loads an empty white area or unresponsive controls after an update, with JavaScript errors in the console.
Read the fix page-builder rest-apiPage Builder Editor Will Not Load or Save
The Elementor, Divi, or other builder editing screen spins indefinitely, loads blank, or refuses to save, while the published page…
Read the fix rest-api security-pluginREST API Blocked by a Security Plugin, Firewall, or Server Rule
Requests to /wp-json/ return 401, 403, or an HTML error page instead of JSON, breaking the editor and any plugin…
Read the fix block-editor rest-api wp-adminBlock Editor Cannot Save – ‘The Response Is Not a Valid JSON Response’
Saving or updating a post in the editor fails with 'Updating failed. The response is not a valid JSON response.'
Read the fixMedia – Thumbnails Not Generating or Serving the Wrong Size
Full-size images exist but the resized versions 404 or the wrong dimensions are served, commonly after a migration or a…
Read the fix media-uploadMedia Upload – ‘Unable to Create Directory’ (uploads Folder Not Writable)
The uploader reports it cannot create a directory under wp-content/uploads and asks whether the parent directory is writable.
Read the fix media-upload upload-limitMedia Upload – File Exceeds the Maximum Upload Size Allowed
The uploader rejects the file outright, naming a maximum size lower than the file being uploaded.
Read the fix media-upload memory-limit timeoutMedia Upload – Generic ‘HTTP Error’ While Processing the File
The upload progress bar completes and then the uploader shows only 'HTTP error', with no further detail in the browser.
Read the fix media-upload wp-adminMedia Uploads Failing in the Media Library
Uploading a file in wp-admin fails; this is the entry-point issue - branch on the exact error the uploader reports.
Read the fix