I went to Main Settings and it was in Default (Black) Color Mode. I changed to Grey and Light but still nothing.
I then clicked on Reset Preferences (which I did many times before), closed and reopened app and now its back! WTF!
In the bottom right hand corner of the Sensor Status window, I click on Configure Sensors and tabs come up (General, Layout, Customise etc) but I do not see a Sensors tab.