I think others have had this problem before with some browsers. If you go down to the bottom of the screen there are clickable sections- they don't show subsections but if you click on the one you want there is a message on some from Ed advising of sub categories. Does that help you post Questions?
Use refresh in Edge to reveal sub cats. Not the AB "refresh" button but the top left arrowed circle just under the tool bar. After it has re-loaded, the + signs for sub cats. will be there.
I would try the same method to get chrome to load the question box.
I have pointed this out previously to the tech wonks at HQ.
Don't you get a question box then for any category? Even without the "+" for the subcategories I can still get into the main categories and then choose the releavant subsections listed in red.
If you get no answer to the chrome problem I will have a look tomorrow AM Talbot. I am using Edge at the mo and cannot be fannied closing and opening browsers. Just a tip, the Edge solution only works once. After you have opened a sub. cat. you have to refresh top left all over again.