Can’t switch between Visual and Code tab…

Again, my visual tab is off. I can’t switch from Code to the Visual again (second time it happens). And this time I did not change any file… None!

=(

I went to my profile and checked the box use Visual editor, but nothing changed (it was already checked, I unchecked and checked again).

What to do now? Re-send all the files again? I have no idea to fix this.

It is happening on both sites I own, weird.