Hi Ian . . . I have this saved as part of my "Normal" template, so it always comes up working like I want.
If I load another template where it is not set up (eg. 16 track audio template), the way I can get it to work is by first undocking everything, get both TV and CV windows into the maximized position, then click top left of console window - and select "disable floating", then maximize CV again, then the key command Ctrl-TAB works.
Hope this helps.