Thanks, Yes it was a HighDesign file . In the mean time I discovered myself.
After import, you set "view" as "Isometric". Delete these 3D elements. ( don't forget any) and then set the view back to "top". The 3D elements are only on 1/2 or 1/4 arc's
Than you can do a safe-file without abort.
The crash report say " Heiviest Stack"
As you get older, everything become worse, except for the oblivion, which is getting better and better ...
Beta tester- EazyCNC