Error with axis

[[Za...]]

Hello colleges, some time I have this problem coordinate system change direction from +Z to -Z and stylus go in incorrect way. Then i take point in plane in cad window Calipso show point with opposite normal vector. Coordinate system of this program is axis - cylinder,
rotation - plane perpendicular to cylinder,
X0, Y0 - cylinder,
Z0 - top plane.
I run this program in to Dura max, in one it work, in over it have error

error.PNG

[[Ri...]]

Vladimir, what you might try is to Right Click on the field for Space Axis and select Formula. In the Formula field you will enter Z then click on OK to close. This might help stabilize the Space Axis.