The simple keyboard combination of Alt-Tab to switch between applications doesn't work.
I have followed this answer but it doesn't answer the question as I want to switch to another application, not display applications and then have to select it via the mouse as it defeats the purpose of the quick switch to the other application.
There is also mention of updating the Keyboard shortcut settings. My keyboard combination is set to the Alt-Tab in the shortcut section and it doesn't switch applications. Seems the setting is ignored as I changed it to another keyboard combo and it just doesn't switch applications.