Well, I do a lot of little stuff and this is the first time I've noticed this happening.
Here's more of the same program, only the radius that is tilted on a 45 has the problem.
N1980 G00 Z0.0800
N1990 X-2.8500 Y-1.8000
N2000 G01 Z-0.0080 F4.0
N2010 G17
N2020 G02X-2.8000Y-1.7500I0.0500J0.0000 F6.0
N2030 G01 X-2.7000
N2040 G02Y-1.8500I0.0000J-0.0500
N2050 G01 X-2.7500
N2060 Y-2.4500
N2070 X-1.8500
N2080 Y-2.3000
N2090 G02X-1.7500I0.0500J0.0000
N2100 G01 Y-2.4500
N2110 X-1.5500
N2120 Y-2.2000
N2130 G02X-1.4500I0.0500J0.0000
N2140 G01 Y-2.5000
N2150 G02X-1.5000Y-2.5500I-0.0500J0.0000
N2160 G01 X-2.9000
N2170 G02Y-2.4500I0.0000J0.0500
N2180 G01 X-2.8500
N2190 Y-1.6500
N2200 X-2.6054
N2210 Y-2.3000
N2220 G03X-2.5554Y-2.3500I0.0500J0.0000
N2230 G01 X-2.2000
N2240 G03Y-2.2500I0.0000J0.0500
N2250 G00 Z0.0800
N2260 X-2.8500 Y-2.1000
N2270 G01 Z-0.0080 F4.0
N2280 G02X-2.9500I-0.0500J0.0000 F6.0
N2290 G01 Y-1.6000
N2300 G02X-2.9000Y-1.5500I0.0500J0.0000
N2310 G01 X-1.5000
N2320 G02Y-1.6500I0.0000J-0.0500
N2330 G01 X-2.5054
N2340 Y-2.2500
N2350 X-2.4500
N2360 Y-2.1000
N2370 G02X-2.3500I0.0500J0.0000
N2380 G00 Z0.0800
N2390 X-2.3000 Y-1.8500
N2400 G01 Z-0.0080 F4.0
N2410 G02Y-1.9500I0.0000J-0.0500 F6.0
N2420 G01 X-2.4000
N2430 G02Y-1.8500I0.0000J0.0500
N2440 Y-1.7500I0.0000J0.0500
N2450 G01 X-2.2000
N2460 G02Y-1.8500I0.0000J-0.0500
N2470 G01 X-2.4000
N2480 G00 Z0.0800
N2490 X-1.7000 Y-1.6500
N2500 G01 Z-0.0080 F4.0
N2510 G03Y-1.7500I0.0000J-0.0500 F6.0
N2520 G01 X-1.5500
N2530 Y-1.9500
N2540 X-2.1000
N2550 G03Y-2.0500I0.0000J-0.0500
N2560 G01 X-1.5000
N2570 G03X-1.4500Y-2.0000I0.0000J0.0500
N2580 G01 Y-1.7000
N2590 G03X-1.5000Y-1.6500I-0.0500J0.0000
N2600 G00 Z0.0800
N2610 X-1.9000 Y-1.8500
N2620 G01 Z-0.0080 F4.0
N2630 G02Y-1.7500I0.0000J0.0500 F6.0
N2640 G01 X-1.7000
N2650 G02Y-1.8500I0.0000J-0.0500
N2660 G01 X-1.9000
N2670 X-2.0000
N2680 G03Y-1.9500I0.0000J-0.0500
N2690 G01 X-1.9000
N2700 G03Y-1.8500I0.0000J0.0500
N2710 G00 Z0.0800
N2720 X-2.3000 Y-1.9500
N2730 G01 Z-0.0080 F4.0
N2740 G02X-2.2500Y-2.0000I0.0000J-0.0500 F6.0
N2750 G01 Y-2.1500
N2760 X-2.1207
N2770 X-2.0354 Y-2.0646
N2780 G02X-1.9646Y-2.1354I0.0354J-0.0354
N2790 G01 X-2.0500 Y-2.2207
N2800 Y-2.4000
N2810 G02X-2.1500I-0.0500J0.0000
N2820 G01 Y-2.2500
N2830 X-2.3500
N2840 Y-2.0500
N2850 X-2.4000
N2860 G02Y-1.9500I0.0000J0.0500
N2870 G00 Z0.0800
N2880 X-2.8500 Y-2.3000
N2890 G01 Z-0.0080 F4.0
N2900 G03X-2.9500I-0.0500J0.0000 F6.0
N2910 X-2.8500I0.0500J0.0000
N2920 G00 Z0.0800
N2930 X-2.6500 Y-1.9000
N3080 M5 M9
N3090 G00 x0y0
N3100 M30
Cheers,
Walt