Lito Yap
Ansys Employee

Are you able to run the following commands from Spyder Notebook on windows? Does it create and save the FDTD simulation file? 

import numpy as np
import matplotlib.pyplot as plt
import os
import imp
lumapi = imp.load_source("lumapi","C:\\Program Files\\Lumerical\\v231\\api\\python\\lumapi.py")
os.add_dll_directory("C:\\Program Files\\Lumerical\\v231\\api\\python")
fdtd = lumapi.FDTD()
fdtd.addfdtd()
fdtd.addring()
fdtd.addmesh()
fdtd.save("lumtestpy.fsp")