I'm not sure, but I think you need to update your main window in the sub 'updateScreen'. Updating your window is required if you want to update a progress bar. 

sub updateScreen {
    my ($comm, $percent_done)=@_;
    ($percent_done = $comm->dequeue ) if $comm->pending;       
    $mw->update();  # <--- update main window
    }

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In reply to Re: Tk::ProgressBar and threads by Sandy
in thread Tk::ProgressBar and threads by dannoura

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