KeyError vtk_backplot

hi,

i'm not sure if this is a bug or not.. I'm using the devolper version and even re installed it. 

When changing the WCS to another than G54 directly after referencing the machine, i will get a backplot error when loading a nc program. I use the example ones "3D_CHIPS.ngs and THREADING.ngc..

File: vtk_backplot.py line 767, in load_program
point_01_pos = self.path_offset_start_point[prev_wcs_index]

it happens here:
            LOG.debug("

---

length(path_actors): {}".format(len(self.path_actors)))
            if len(self.path_actors) > 1:
                # Load the start point of rapid from the next offset paths
                LOG.error(f"prev_wcs_index {prev_wcs_index} not found in path_offset_start_point")
                point_01_pos = self.path_offset_start_point[prev_wcs_index]

out:
[qtpyvcp.widgets.display_widgets.vtk_backplot.vtk_backplot][DEBUG] 

---

wcs_index: 1 (vtk_backplot.py:705)
[qtpyvcp.widgets.display_widgets.vtk_backplot.vtk_backplot][DEBUG] 

---

current_offsets: [50.0, 50.0, 0.0, 0.0, 0.0, 0.0] (vtk_backplot.py:709)
[qtpyvcp.widgets.display_widgets.vtk_backplot.vtk_backplot][DEBUG] 

---

current_position: 50.0 (vtk_backplot.py:750)
[qtpyvcp.widgets.display_widgets.vtk_backplot.vtk_backplot][DEBUG] 

---

length(path_actors): 2 (vtk_backplot.py:766)
[qtpyvcp.widgets.display_widgets.vtk_backplot.vtk_backplot][ERROR]  prev_wcs_index 0 not found in path_offset_start_point (vtk_backplot.py:769)
[qtpyvcp.app.launcher][CRITICAL]  Unhandled exception in vtk_backplot.py line 770 (launcher.py:37)

Seems that this code was changed two months ago.. 

br