Mohamed <allawat...@gmail.com> added the comment:

Please find attached, the demo with dummy data. As I mentioned, it was working 
fine until May 1st. 
Also, As I mentioned, in case I call MasterApp at the end of add function data 
appears correctly. This means a malfunction occurred after Windows Update, and 
it relates to mainloop

    class MasterApp(object):
        def __init__(self, root):
        ....

        def fun_astinfo_add(self):
            ...
            assetinfo_lst.append(lst_values)
            ...
            MasterApp(root)

        ...
    if __name__ == "__main__":
        root = Tk()
        App = MasterApp(root)
        root.mainloop()

----------
Added file: https://bugs.python.org/file50030/Issue in Tkinter with Python 2.pdf

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<https://bugs.python.org/issue44076>
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