Try deactivating all plugins. If that resolves the issue, reactivate each one individually until you find the cause.
If that does not resolve the issue, try switching to the Twenty Fifteen theme to rule-out a theme-specific issue (theme functions can interfere like plugins).
My Visual editor is broken, too. Nothing can be typed in the box, and only the Add Media button is showing. It is not a plugin problem, and the theme is fine.
At this point, the deactivate-all-plugins advice is not very useful. The majority of today’s problems were caused by the 4.2.4 update, which clearly wasn’t ready for prime time.
Hopefully, WordPress is working on a fix.
BTW, I just checked the editing page with Chrome’s inspector, and this is what I found:
http://jaiden.io/wp-includes/js/tinymce/plugins/wpview/plugin.min.js?wp-mce-4109-20150505 Failed to load resource: the server responded with a status of 404 (Not Found)
tinymce.min.js?ver=4109-20150505:4 Failed to load: http://jaiden.io/wp-includes/js/tinymce/plugins/wpview/plugin.min.js
It’s a missing file. Nothing to do with plugins or themes.
If the above troubleshooting didn’t help, please open your own thread: https://wordpress.org/support/forum/how-to-and-troubleshooting#postform
No worries, a common misconception. Two very similar sets of symptoms could be two very different problems. Having your own thread keeps discussions organized and less confusing for everyone involved.
Actually, freneticgeek, it looks like someone else was already helping you in https://wordpress.org/support/topic/bug-in-wp-424
Might as well stick to that.
