Ohh. Um. I believe this is right, but there is something you have to press to make it so you can see your codes.
I haven't had to do it since the update, but I believe this will help you.
You see on the bar above the text box, where I circled in red?
When you move your cursor over it, it should say 'Switch Editor Mode'.
Click that and it should fix your problem and show your codes once more~