I am having the same issues since yesterday. My visual editor is neither loading nor working. But I can see all the work in Text editor. I am a non technical person and write a good blog. This has left me very frustrated also. I guess my trouble also started with the upgrade of latest WP version.
Any help here in simple non technical words. I have de cluttered my plug in page. Also important thing to notice is that I recently installed Smush it plugin. Can that also cause trouble?