I am getting an error in Mach 3 that begins with the words "J Word Given For Arc" after generating code to cut a simple circle even in Lazy Cam.
I start with a circle, offset it, generate code and get errors. Squares are fine.
Anybody have any ideas.

Sounds like you're missing the J in the G2 or G3 line. you'll need to post the code.

It chokes at the first G2 code on line 60
Here it is:

N5 (File Name = Testes2 on Saturday, December 11, 2010)
N10 (Default Mill Post)
N15  G91.1
N20 M5 M9
N25 M6 T2(TOOL Change 1/2" Cutter)
N30 G43 H2
N35 G0  Z1.0000
N40 M3 S10000
N45  X6.2500  Y3.0001
N50  Z0.1000
N55 G1  Z-0.1250  F5.00
N60 G2  X9.7500  Y3.0000  I1.7500  J-0.0001  F50.00
N65  X6.2500  Y3.0001  I-1.7500  J0.0000
N70 G0  Z0.1000
N75 G1  Z-0.2500  F5.00
N80 G2  X9.7500  Y3.0000  I1.7500  J-0.0001  F50.00
N85  X6.2500  Y3.0001  I-1.7500  J0.0000
N90 G0  Z0.1000
N95 G1  Z-0.3750  F5.00
N100 G2  X9.7500  Y3.0000  I1.7500  J-0.0001  F50.00
N105  X6.2500  Y3.0001  I-1.7500  J0.0000
N110 G0  Z0.1000
N115 G1  Z-0.5000  F5.00
N120 G2  X9.7500  Y3.0000  I1.7500  J-0.0001  F50.00
N125  X6.2500  Y3.0001  I-1.7500  J0.0000
N130 G0  Z0.1000
N135 G1  Z-0.6250  F5.00
N140 G2  X9.7500  Y3.0000  I1.7500  J-0.0001  F50.00
N145  X6.2500  Y3.0001  I-1.7500  J0.0000
N150 G0  Z0.1000
N155 G1  Z-0.7500  F5.00
N160 G2  X9.7500  Y3.0000  I1.7500  J-0.0001  F50.00
N165  X6.2500  Y3.0001  I-1.7500  J0.0000
N170 G0  Z1.0000
N175  X3.7500  Y6.2500
N180  Z0.1000
N185 G1  Z-0.1250  F5.00
N190  Y8.7500   F50.00
N195  X2.5000   
N200  X1.2500  Y8.7500   
N205  Y6.2500   
N210  X3.7500   
N215 G0  Z0.1000
N220 G1  Z-0.2500  F5.00
N225  Y8.7500   F50.00
N230  X2.5000   
N235  X1.2500  Y8.7500   
N240  Y6.2500   
N245  X3.7500   
N250 G0  Z0.1000
N255 G1  Z-0.3750  F5.00
N260  Y8.7500   F50.00
N265  X2.5000   
N270  X1.2500  Y8.7500   
N275  Y6.2500   
N280  X3.7500   
N285 G0  Z0.1000
N290 G1  Z-0.5000  F5.00
N295  Y8.7500   F50.00
N300  X2.5000   
N305  X1.2500  Y8.7500   
N310  Y6.2500   
N315  X3.7500   
N320 G0  Z0.1000
N325 G1  Z-0.6250  F5.00
N330  Y8.7500   F50.00

Oh, and the entire error is: J word given for arc in xz planeLine 11

Thanks for having a look!!!!

You ran some other code that called G18 and put you in the XZ plane, and didn't return to the XY plane.

MDI G17, or better yet, put a G17 at the start of your code, and it'll run fine.

N5 G17 (File Name = Testes2 on Saturday, December 11, 2010)
N10 (Default Mill Post)
N15  G91.1
N20 M5 M9
N25 M6 T2(TOOL Change 1/2" Cutter)
N30 G43 H2
N35 G0  Z1.0000
N40 M3 S10000
N45  X6.2500  Y3.0001
N50  Z0.1000
N55 G1  Z-0.1250  F5.00
N60 G2  X9.7500  Y3.0000  I1.7500  J-0.0001  F50.00
N65  X6.2500  Y3.0001  I-1.7500  J0.0000
N70 G0  Z0.1000
N75 G1  Z-0.2500  F5.00
N80 G2  X9.7500  Y3.0000  I1.7500  J-0.0001  F50.00
N85  X6.2500  Y3.0001  I-1.7500  J0.0000
N90 G0  Z0.1000
N95 G1  Z-0.3750  F5.00
N100 G2  X9.7500  Y3.0000  I1.7500  J-0.0001  F50.00
N105  X6.2500  Y3.0001  I-1.7500  J0.0000
N110 G0  Z0.1000
N115 G1  Z-0.5000  F5.00
N120 G2  X9.7500  Y3.0000  I1.7500  J-0.0001  F50.00
N125  X6.2500  Y3.0001  I-1.7500  J0.0000
N130 G0  Z0.1000
N135 G1  Z-0.6250  F5.00
N140 G2  X9.7500  Y3.0000  I1.7500  J-0.0001  F50.00
N145  X6.2500  Y3.0001  I-1.7500  J0.0000
N150 G0  Z0.1000
N155 G1  Z-0.7500  F5.00
N160 G2  X9.7500  Y3.0000  I1.7500  J-0.0001  F50.00
N165  X6.2500  Y3.0001  I-1.7500  J0.0000
N170 G0  Z1.0000
N175  X3.7500  Y6.2500
N180  Z0.1000
N185 G1  Z-0.1250  F5.00
N190  Y8.7500   F50.00
N195  X2.5000   
N200  X1.2500  Y8.7500   
N205  Y6.2500   
N210  X3.7500   
N215 G0  Z0.1000
N220 G1  Z-0.2500  F5.00
N225  Y8.7500   F50.00
N230  X2.5000   
N235  X1.2500  Y8.7500   
N240  Y6.2500   
N245  X3.7500   
N250 G0  Z0.1000
N255 G1  Z-0.3750  F5.00
N260  Y8.7500   F50.00
N265  X2.5000   
N270  X1.2500  Y8.7500   
N275  Y6.2500   
N280  X3.7500   
N285 G0  Z0.1000
N290 G1  Z-0.5000  F5.00
N295  Y8.7500   F50.00
N300  X2.5000   
N305  X1.2500  Y8.7500   
N310  Y6.2500   
N315  X3.7500   
N320 G0  Z0.1000
N325 G1  Z-0.6250  F5.00
N330  Y8.7500   F50.00

Thanks Gerry,
That does seem to make it run. That may have to do with the fact that I am using SolidWorks to make the DXF and selecting the top plane. Perhaps the front plane would work better.
Any idea why it's cutting a gigantic circle? It was supposed to cut a 4" circle from the inside using a 1/2" bit.
Thanks again for your time. I am getting a V90 Fireball next week and am trying to figure out how to run simple parts.