Hi Adrian, I used wrong terminology, I highlighted all my toolpath, then went to PREVIEW ALL TOOLPATHS, but the toolpath checked boxes became unchecked and nothing showed up in the animated view in 3D view. I have gone back through the tutorial and checked all the settings..... I think
Preview All Toolpaths will uncheck all the toolpaths one by one as it displays them so that's normal. If nothing is showing up the most likely cause is that the cut is too shallow to appear. If possible the best way to solve this would be for you to attach the actual Cut2D file here. If that's not possible (copyright, commercial reasons etc) then some screenshots of the toolpath settings etc would help.
One thing to try is to increase the preview resolution. You can adjust that on the Toolpaths>Preview Simulation Quality menu.