Ok, here is a snipit, but I don't think the code is the problem. When I load it Mach removes all the line numbers.
N0000 (Filename: driver pattern.tap)
N0010 (Post processor: Mach2.post)
N0020 (Date: 1/30/2010)
N0030 G20 (Units: Inches)
N0040 G40 G90
N0050 F1
N0060 (Part: Driver Pattern)
N0070 (Process: Inside offset CUT2, 1/2" Ball nose, 0.375 in Deep)
N0080 G00 Z0.5000
N0090 X0.0000 Y0.0000
N0100 (1/2" Ball nose)
N0110 T225 M06 G43 H225
N0120 M03 S20000
N0130 G00 X0.0000 Y0.0000 Z0.5000
N0140 X5.5150 Y4.5000
N0150 Z0.0197
N0160 G01 Z0.0000 F50
N0170 G03 X5.5073 Y4.6247 Z-0.1250 I-1.0150 J0.0000
N0180 X5.5150 Y4.5000 I-1.0073 J-0.1247 F25.0
N0190 X5.5073 Y4.6247 Z-0.2500 I-1.0150 J0.0000 F50.0
N0200 X5.5150 Y4.5000 I-1.0073 J-0.1247 F25.0
N0210 X5.5073 Y4.6247 Z-0.3750 I-1.0150 J0.0000 F50.0
N0220 X5.5073 Y4.6247 I-1.0073 J-0.1247 F25.0
N0230 G00 Z0.2500