I’m using the latest version of wp and yesterday I encountered this problem, so today it was resolve my my host CSA. What he did is he went into my
1. admin area then
2. users then
3. your profile
4. on my profile area he uncheck the box at the top of the page which says disable the visual editor when writing.
and now its working fine. I hope this will help you.
len7288
https://www.healthandbeautypages.com