I had a new install of 3.4.1 and was experiencing this problem. Tried all recommended fixes.
What worked for me was to re-install WordPress from the Updates page. It said that I did not require any updates, but I did it anyway using the automatic update.
The update took about 20 seconds and it came back up with the HTML/visual editors working and toggling fine.
Thanks Richie –
Samuel – the instructions you provide make sense and I will follow them. Will this recover the lost work?
I don’t want to take any steps that will prevent me from being able to recover the posts. (It’s a lot of writing!)
Thanks fro clarification…
Harry
