does Mach 3 recognize I & J codes ? I have Mach 2 on my machine and it doesn't see them example is G03 I**** J*** . The machine stops as soon as it gets to the G03 I.

You probably have to change the I,J mode in Config>State. Are you getting an error mesage on the screen about an arc endpoint incorrect or something like that?

Also, make sure you have an X, Y and Z as well as an I and J if the first thing doesnt work.

G3 X0 Y0 Z-.125 I1 J1

no error message the machine just stops the NC Plot editer runs the code just fine when I run my machine it runs until it hits the I code then stops. I was useing bob-cad 19 then purchased v 20 then this started . V 20 mustof took over v19 because it started doing it there also.

Can you post the code, including a few lines before and afer the problem?

I have already deleted it but I will reproduce it in a little bit .