I’ve encountered a minor defect in the drag and drop processing on the Toolpath dialog (Windows 10 64 Bit).
If you drag a toolpath DIRECTLY over another, and drop it, the toolpath disappears.
Starting Point:
Drag bottom TP directly over the fourth

And Drop. The fifthTP disappears.

Repeating the process until there’s only one TP left

HOWEVER: This is only a render issue. Saved the file as Test and then opened the project…all the toolpaths are back:
- Gary