I am having a strange problem. I am using XP Pro. Running a CNC router with Mach 3 I used NF wizard to program a Rectangle the control runs fine it jogs, homes and has run some of the other files "road runner" etc. Today after programming and posting I started the program setting the z 0 high to test the program. The control cut three sides and then went nuts. I jumped around in the Y and X axis in rapid moves. The toolpath tracked the movements. The Code looks normal. no od rapid moves in the program. I am running a dell P4 . What am I doing wrong. Thank you