Finally a long-standing bug with some Windows 7 systems has been fixed. The code would crash when loading a background image of the world, but not on all W7 systems.
A description of the problem and the solution is here [link] - breaking change a while ago from Microsoft.
Anyway, it's now time to rejoise if you were affected - your satellite tracking is fixed with version 3.0.22 which will be released 'soon'.
After talking on QO-100 with Mike, G0MJW i've ordered a LibreSDR from AliExpress where it's known as "SDR AD9363 AD9361 ZYNQ7020 ADI Pluto communication experiment platform".