Updated our main PC today with 2016.1 Result was all my Garmin maps being locked. Eventually sorted by calling Garmin support who gave me the best laugh in weeks. When discussing Basecamp I said I preferred Mapsource and that I was not alone in this, in fact many folk complain about Basecamp. His reply, and I suspect one mindful of the fact that big brother might just be listening, was that he had never heard of anyone complaining about Basecamp. Still he sorted the problem and we are back up and running.
John