Looks like it is a problem with your generated Gcode.

If you attach your Gcode file it can be checked.

Tweakie.

No. It´s nothing wrong with the g-code. It works properly on a win-7 installation I have on another PC. Here is the G-code:

G01 X0 Y0 Z27,5 F30

G01 X1,1813 Y0 Z27,4785 F30

G03 X1,1813 Y0 I-1,1813 J0 F30

G01 X2,361 Y0 Z27,4141 F30

G03 X2,361 Y0 I-2,361 J0 F30

G01 X3,5376 Y0 Z27,3069 F30

G03 X3,5376 Y0 I-3,5376 J0 F30

G01 X4,7095 Y0 Z27,157 F30

G03 X4,7095 Y0 I-4,7095 J0 F30

G01 X5,8752 Y0 Z26,9645 F30

G03 X5,8752 Y0 I-5,8752 J0 F30

G01 X7,0332 Y0 Z26,7299 F30

G03 X7,0332 Y0 I-7,0332 J0 F30

G01 X8,1818 Y0 Z26,4533 F30

G03 X8,1818 Y0 I-8,1818 J0 F30

G01 X9,3197 Y0 Z26,1351 F30

G03 X9,3197 Y0 I-9,3197 J0 F30

G01 X10,4452 Y0 Z25,7758 F30

G03 X10,4452 Y0 I-10,4452 J0 F30

G01 X11,5569 Y0 Z25,3758 F30

G03 X11,5569 Y0 I-11,5569 J0 F30

G01 X12,6533 Y0 Z24,9357 F30

G03 X12,6533 Y0 I-12,6533 J0 F30

G01 X13,733 Y0 Z24,456 F30

G03 X13,733 Y0 I-13,733 J0 F30

G01 X14,7946 Y0 Z23,9373 F30

G03 X14,7946 Y0 I-14,7946 J0 F30

G01 X15,8366 Y0 Z23,3805 F30

G03 X15,8366 Y0 I-15,8366 J0 F30

G01 X16,8577 Y0 Z22,7861 F30

G03 X16,8577 Y0 I-16,8577 J0 F30

G01 X17,8565 Y0 Z22,155 F30

G03 X17,8565 Y0 I-17,8565 J0 F30

G01 X18,8317 Y0 Z21,488 F30

G03 X18,8317 Y0 I-18,8317 J0 F30

G01 X19,782 Y0 Z20,7861 F30

G03 X19,782 Y0 I-19,782 J0 F30

G01 X20,7062 Y0 Z20,05 F30

G03 X20,7062 Y0 I-20,7062 J0 F30

G01 X21,603 Y0 Z19,2808 F30

G03 X21,603 Y0 I-21,603 J0 F30

G01 X22,4713 Y0 Z18,4796 F30

G03 X22,4713 Y0 I-22,4713 J0 F30

G01 X23,3099 Y0 Z17,6473 F30

G03 X23,3099 Y0 I-23,3099 J0 F30

G01 X24,1176 Y0 Z16,7851 F30

G03 X24,1176 Y0 I-24,1176 J0 F30

G01 X24,8935 Y0 Z15,8941 F30

G03 X24,8935 Y0 I-24,8935 J0 F30

G01 X25,6365 Y0 Z14,9755 F30

G03 X25,6365 Y0 I-25,6365 J0 F30

G01 X26,3456 Y0 Z14,0304 F30

G03 X26,3456 Y0 I-26,3456 J0 F30

G01 X27,0199 Y0 Z13,0603 F30

G03 X27,0199 Y0 I-27,0199 J0 F30

G01 X27,6585 Y0 Z12,0662 F30

G03 X27,6585 Y0 I-27,6585 J0 F30

G01 X28,2605 Y0 Z11,0497 F30

G03 X28,2605 Y0 I-28,2605 J0 F30

G01 X28,8252 Y0 Z10,0119 F30

G03 X28,8252 Y0 I-28,8252 J0 F30

G01 X29,3518 Y0 Z8,9542 F30

G03 X29,3518 Y0 I-29,3518 J0 F30

G01 X29,8396 Y0 Z7,8781 F30

G03 X29,8396 Y0 I-29,8396 J0 F30

G01 X30,288 Y0 Z6,7851 F30

G03 X30,288 Y0 I-30,288 J0 F30

G01 X30,6963 Y0 Z5,6764 F30

G03 X30,6963 Y0 I-30,6963 J0 F30

G01 X31,0641 Y0 Z4,5536 F30

G03 X31,0641 Y0 I-31,0641 J0 F30

G01 X31,3908 Y0 Z3,4182 F30

G03 X31,3908 Y0 I-31,3908 J0 F30

G01 X31,6761 Y0 Z2,2717 F30

G03 X31,6761 Y0 I-31,6761 J0 F30

G01 X31,9194 Y0 Z1,1155 F30

G03 X31,9194 Y0 I-31,9194 J0 F30

G01 X32,1206 Y0 Z-0,0487 F30

G03 X32,1206 Y0 I-32,1206 J0 F30

G01 X32,2794 Y0 Z-1,2195 F30

G03 X32,2794 Y0 I-32,2794 J0 F30

G01 X32,3954 Y0 Z-2,3952 F30

G03 X32,3954 Y0 I-32,3954 J0 F30

G01 X32,4687 Y0 Z-3,5744 F30

G03 X32,4687 Y0 I-32,4687 J0 F30

G01 X32,4991 Y0 Z-4,7555 F30

G03 X32,4991 Y0 I-32,4991 J0 F30

G01 X32,5 Y0 Z-5 F30

G03 X32,5 Y0 I-32,5 J0 F30