I've seen similar problems with the progressbar before, although I don't have an example handy. Sometimes it just won't update from the scalar ref in realtime. It probably has something to do with the event loop scheduling. In those cases, just explicity set the progressbar to the new value in your update routine 
$ProgressBar->value($value);
#and just to force the event loop
$mw->update;

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In reply to Re: Updating the Tk::ProgressBar live by zentara
in thread Updating the Tk::ProgressBar live by Ace128

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