Ger21 is correct. This has happened with my Mach 2 software as well. I had code that I ran before fine. I did an upgrade of Mach 2 to a newer version and the code had large circles all around the part. Somehow Mach 2 had changed it's setting from Inc. to Abs. You must look through the setup screens to find where to change this. I can't remember where and I'm not at a Mach 2 computer now.
Thanks
Jeff Davis (HomeCNC)
http://www.homecnc.info
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)