CAM generating reversed toolpaths.

[j.krebs]

I have a simple test piece where that has apart surface that is .25 x 2 inch.  There is a .020" deep .25" x .25" step at one end that needs to be cut.  I use this to test the accuracy of the depth of cut.  Previously the toolpath would start at the other edge and work toward the step (the riser).  I went create a new tool path and now it starts by full slotting along the riser, and then working toward the outer edge of the part.  Any idea why this is happening?  

[j.krebs]

This is a simulation issue.  I ran the path on the real machine and it cut the way that I expected it to and the way it has always worked. It started at the end of the material and worked it's way toward the step riser.