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I am currently baffled as to what happened. I run CandCNC plasma system with mach 3 and recently ran into two computers with issues. I use sheetcam to generate the Gcode and all has been fine until yesterday.
for some reason the when loading the g code and it lists in mach 3 the code is not what it used to be.? It starts out with gcode like 0 SECTION, 2 HEADER, $ACADVER, AC1021, $ACADMAINTVER.? I am totally lost as to why this happened. Both computers were side by side with only one wired up and plugged in. They both act the same.?
Any help would be greatly appreciated.
Thanks in advance.

Sounds like your loading a dxf file..

you are correct Art, thanks for the reply. Saved me lots of grief. I had never had that happen before. One to watch out for. Again Art thank you very much for taking time to reply.