Hi Team, This bug is related to module = Tkinter , method = destroy(). Considering I am able to open below window and Project Deliver List is a button. When we press this button, below pop-up appears with which I am able to save my file. Now, when we use below code for the first window: root = Tk() root.after(3000, lambda: root.destroy()) If I am using this code on Mac OS, then on clicking on button ‘root.destroy()‘ command hold as it should. But on Windows OS, while I am saving the file, ‘root.destroy()’ destroy the pop-up. Please look into this as I have to deliver this to client. Thanks, Tarun Garg