I suspect that recording might still be an issue. I often run PlanePlotter in the background reading the RadarBox recorded file. Often, when I go to look at PlanePlotter, it has stopped showing the RadarBox tracks. RadarBox is stil running fine, but the recording file is no longer being updated.
As I said, RadarBox continues to run OK, but maybe the recording failing is something to do with the problems that some people are having.
Overall, I'm very happy with V1.5. It runs all day on the laptop without an internet connection, and it's as solid as a rock on the main PC with Internet :-)