PS Disable Auto Formatting disables text editor

I’ve just discovered that PS Disable Auto Formatting disables the text editor on WP 4.4

I can see that others are having problems with the visual editor, but in my case it’s the text editor that I can’t use unless I disable this plugin.

And now I can’t remember why I’m using this plugin anyway ! … can anyone remind me ?

https://www.ads-software.com/plugins/ps-disable-auto-formatting/