Hi, Willem
Compare your Mach settings on your computer's, Look at Config, ports & pins, Turn Options, "Reversed Arc's Front Post" settings, Should be the same both computers.
Also check after running the same file on both computer's that, Config, General Config, that "Distance Mode" is set to Absolute on your first computer.
Enter on the MDI line a G90 enter, then Regen the View on your problem Computer.
At present LazyCam is only posting G91.1 for IJ Inc. preamble setting's and not insuring that G90 "Distance Mode" is set to Absolute Mode.
G90 & G91 set "Distance Mode" ABS or INC.
G90.1 & G91.1 set "I,J" Mode ABS or INC.
Hope this Helps, Chip