I have over 30 WP sites and suddenly on 5 of them when you add an image it fails.
The image itself uploads to the relevant file on the server but it is when you click "Insert into Post" that the 404 error page comes up and the only way forward is to close the panel down which obviously isn't adding the image to the posting.
I have tried:
- reinstalling the latest version of WP manually
- deactivating all plugins
- reverting back to the default theme
None of these have had any affect so I am now at a loss as to what to try next.