Doh!
I have just realised that my screen is only displaying the value of Sensor A. I had misread it as just “A sensor value”. That is why it only changes when I change input A. So just need to work out why my Scratch is not showing all four Sensor values. So probably not the cause of your prog.
BTW I have had Scratch and ScratchCrumble running for several hours now on my Laptop while I watched YouTube videos and did other stuff. No problems so far…
