I had this problem. After automatically updating my managed wordpress to 5.02, I could not update a page or publish a post.
SOLUTION: You must download the classic editor plug in. The problem is with the new editor.
Solved! Go to Solution.
I had the same problem. I wish Godaddy support was aware of this. They suggested a solution that only cost me hours of backup, download and restore that didn't solve anything. Switching to classic editor did the trick!