Hi, this time it's a bug. Rather rare one - it seems it crashes only with point size <= 1 (single pixel) for larger sizes it works ok. I've already committed a fix. An updated installer will be available soon since we already have couple of other fixes waiting. Meanwhile as a workaround please try to set point size to 2. Also the recommended way to set shapefile options is Shapefile.DefaultDrawingOptions.PointSize = 2. Check third section here.
Thank you for reporting this,
Sergei
Thank you for reporting this,
Sergei