Having read these posts I now realise that the problems I had when I upgraded to Basecamp 4.7.0 were not due to anything I did.
I will try the advice given above to blackout the latest version. However does anyone know if Garmin are going to correct this problem anytime soon and bring out a v 4.7.1 or 4.8.0 as this seems to be a reputation damaging glitch.
Thanks