Two functions not working in Studio 2017 after the install of CU 16

I just installed Cumulative update 16 to Studio 2017. Two functions are lost: “Show Whitespace Characters” and “Toggle display of formatting tags”. The whitespace characters are showing in the Translation results window, but not in the editor itself. I cannot see the formatting tags at all, but they are visible when I choose “Edit Translation Unit” in the Translation results window.

The project I am working on was started in CU 15, but it doesn’t help to create a completely new project. I have tried with another file, but it looks like I cannot get these to functions to work at all.

These two functions are important. I really need them back.