Abaqus and Tkinter windows freeze with start of mainloop - python-2.7

Question

I'm working on numercial simulations in Abaqus 2020 and coded a GUI with Tkinter.
My problem is, that while running the Tkinter code everything works well unitl the start of the mainloop. Then both windows of Tkinter and Abaqus freeze. When I first close the Abaqus window, the Tkinter Window works correctly. I tried sth with threads but wihtout success..
Setup: Windows 10, Abaqus 2020, Python 2.7
here you find a minimal example:
import Tkinter as tk
from Tkinter import *
# Creating master Tkinter window
window = tk.Tk()
window.title('TKINTER-mini')
# window.attributes("-fullscreen", True)
width=1200
window.geometry("1800x1000")
# Frames
frame0 = Frame(window, width=width)
label_Titel = tk.Label(master=frame0, text ='Test', font=('Aerial 15 bold'))
label_Titel.grid(row=0, column = 0)
frame0.grid(row=0, column=2, padx=20, pady=20, ipadx = 20, ipady=20)
window.mainloop()
# window.update()
I'm looking forward to get some help. Thank you in advance!
Greets JBKingPile
I tried
#1
def __init__(self):
import threading
threading.Thread.__init__(self)
def shutdown_ttk_repeat(self):
self.mainroot.eval('::ttk::CancelRepeat')
self.mainroot.destroy()
def __init__(self, parent):
self.mainroot = parent
# self.mainroot.protocol("WM_DELETE_WINDOW", self.shutdown_ttk_repeat)
# self.tabpage()
self.root.after(1000, self.refresh())
self.root.mainloop()
#2
try:
# Tk will crash if pythonw.exe has an XP .manifest
# file and the root has is not destroyed explicitly.
# If the problem is ever fixed in Tk, the explicit
# destroy can go.
try:
gui = gui(window)
window.mainloop()
finally:
window.destroy()
except KeyboardInterrupt:
pass
#3
if __name__ == "__main__":
app = simpleapp_tk(window)
window.mainloop()