There have been a few reports from users that cannot start NCPlot because of a crash bug on startup. This particular problem seems to be isolated to users running Windows XP with a SpaceNavigator. If you experience this problem a workaround is to unplug the SpaceNavigator from your computer when starting NCPlot. I know it's a PITA, but this problem should be fixed for v2.20.
If you do run into this, let me know.
Thanks,
Scott