I’ve had an issue recently where the wordpress visual editor stopped working. The code editor worked fine, but the visual button just didn’t do anything at all. I knew it wasn’t a server setting because it impacted 2 of 5 wordpress sites on the server, but the others worked fine. I tried deleting and copying fresh copies of “wp-includes” and “wp-admin” in case something had got corrupted but this didn’t resolve the problem either.
I also tried creating a new user, which loaded with the visual editor activated. However, as soon as I switched to the text editor I got stuck and couldn’t switch back.
I tried disabling all plugins, and changing theme, but neither of these helped, although this might be due to extensive use of caching on the live site.
Eventually I found a suggestion on WPGuru to add a setting to wp-config.php which did the trick.
This suggests that one of the scripts on the 2 affected sites isn’t operating correctly so I will try to track this down. The strange this is that it can’t be a built-in script because I re-copied the wp-admin and wp-includes folders, but it also shouldn’t be a theme or plugin as I switched to a default theme and disabled all plugins! Very strange!
When I have time I will investigate further to pinpoint the problem script and will update this post accordingly. My best guess at the moment is that it is hiding in the wp-content directory structure somewhere
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