Alternate color printing for solid fills
When printing solid fills, the SPLOT program normally uses the CreateSolidBrush function to create a solid brush for that operation. However for some print drivers the color of this fill can differ from color of normal lines. Then you can try to check this option and the SPLOT program will use the CreatePatternBrush function with a pattern composed from normal lines.
The solid fills are printed as results of FP (Fill Polygon) instruction when the solid fill type is used (as set with FT (Fill Type) instruction).