Hi Hugh
You appear to have a couple of issues. As Paul has remarked there are a couple of power warnings in you home page.
Are you using a power source of at least 2amp and the original power lead or a 20swg equivalent.
Secondly your configure page indicates you are still on the default settings for both bearingless (Mode C/S) and positional contacts.
you should have read and understood the info provided regarding using the Mode S/3D before activating it. Then you need to set the Mode to activate (+Filter if you have transponder on board) then adjust the filters to your proference which you will find by experimentation. I suggest Short or Medium as a starter. The default Ultra Short filters all but very close traffic.
I then personaly use +/- 2000'. You also then require to set your ranges for Positional targets as the defaults are very narrow ans as far as I know these override SkyDemon settings. (I don't use SD)
Let us know how you get on
Regards
Alan
Edited to add: With a new upgrade i usually set all filters wide open to ensure I am receiving traffic and then close them down to my comfort zone.