I have been using PL and forerunner for years and never had to nights behaver. It opened with a dark blue background on the right with a very compressed menu bar on the left. I started to load the sniper to get an image and briefly the correct image showed and it crashed closed. No report in W10 reliability or in PL4 error logs. I hope this was a one off and not a tast of a bug intoduced as I haven’t seen anyone elss reporting it doing this. After a reboot its loaded OK.