From your statement the file is getting updated the display just isn't.
The problem is not with textvariable. I had this same problem. I had to redraw the screen after another call to the import file. So I would suggest after you make the change reload the import file and then redraw the screen.
In reply to Re: Tk::Entry not updating when textvariable changes.
by mikasue
in thread Tk::Entry not updating when textvariable changes.
by jdtoronto
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