I tried X-Plane 11 in Demo (MacOS) mode, and then purchased the full digital version online. First attempts provided me with scenery from airports in my home country. After several attempts to fly provided planes, I quit X-Plane to try another day. When starting the application a second (then third, fourth and so on) time with a new flight, I found the airports I'd used previously with full scenery now had only runways, the odd building, and water. What has caused this, and how can I rectify the situation? MacMini, 2018, 16 Gb RAM. 3,2 GHz i7.