Once I got a bit of direction from @Maypack, the system is pretty easy to use to be honest.
I started with a completely new setup and this way of structuring (Siblings) never worked with my MY2018 car:
View attachment 10705
I thought I was going mad, but then I tied the following structure (Child) and it worked straight away:
View attachment 10706
Not sure how you could set up the sibling route any differently. It just never worked. Bit I've updated my Cameras 3 or 4 times now, and the Child way always works.
It's suppose to be the top one. May be Radas altered the program so it's the second one now but works fine for those who have previously done it how he said before !. What you can't do is go mad an do what you could with the RNS units before MIB2. That is the instruction of hanging them off the route. You can't have siblings hanging all over the place in a big tree structure.
Any one else that finds they have to do it the second way rather the first way ?.