I have figured out to run Netduino with 4.2 sdk, 4.2 firmware etc on my Mac in W8.1 pro under Parallels
I am therefore reluctant to revert to a 4.1 set up, since I need to work on my app which appears to demand a 4.2 context, also your previous messages suggested thatI need to be in 4.2 context in order to load the drivers in W8.1 (which does not explicitly support Netduino drivers).
Whilst I may need to come back to this issue - I need to moveon and find alternative systems to use to teach my grandsons programming and electronics.
I therefore mark this as closed.
Thank-you for your time.
DavidGo to the full post