I also am experiencing the problem.
Clicking on visual didn’t work. Clicking to insert a graphic appeared to work but nothing showed up in the edit box. I was able to type in text but it disappeared when I tried to save.
The tech at the host erased the folders for all plugins. It was still broken. He discovered that going to user and disabling the visual editor permitted using the HTML editing. That is where I am now and I’m lousy at HTML.