Can't get the drone DOF & Foreground Blur to work

Hi, When in drone mode, I’ve tried to get the above to work on several occasions, and it’s not having any part of it. Has anybody else had better luck than I?

Current default key bindings:
Toggle Depth of Field-- F1
Toggle Foreground Blur-- F5
Increase Depth of Field-- F3
Decrease Depth of Field-- F2

At least the exposure and auto-exposure work fine.