I suspect you're right. Tkinter.Variable holds a reference to the tkapp instance, which doesn't seem likely to be picklable. Imagining that tkapp instances *were* picklable, unpickling the stringvar would get you a whole new application toplevel that you didn't want.
You might be able to extend pickle in some clever way to make it work, but it would probably be easier and less fragile to arrange to pickle something that is not composed of Tkinter.Variable instances. Jeff
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