Hi Peter,
I had the same, problem, see this thread:
ngsolve.org/forum/ngspy-forum/818-macos-10-14-6-update-warning
But for some it is working. We are working on it.
There are now two possibilities:
1. start via Python:
Code:
python3
import netgen.gui
Also jupyter notebooks should work.
2. update Tcl/Tk to version 8.6.9. It has some updates for Mojave. This interferes with Python's Tcl/Tk 8.6.8, but it is working in my case.
Joachim