I have done further research into my Pop Up non appearance and have got to the bottom up what is happening.
I can now stop and start getting the pop up notifications at will.
It seems that it is linked to the option "play a sound" alert. On my old PC I had speakers permanently connected. On the new PC I did not. So if I tick play a sound with no speakers attached the pop up notification doesn't appear.
As soon as I plug speakers (or Bluetooth headphones) into the new PC the pop up notifications appear, if unplug they stop. Similarly, if I untick "play a sound" they also appear.
So potentially another bug to go into the list that probably won't get fixed. Or will we get a v6.x or v7?
Graham