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  select items in more than one Tk listbox at a time?
 The default for Tk`s listbox widget exports its selection as the
X selection.  There can only be one of these at a time.

To turn off this behavior in Tk, use the -exportselection false when
you create the listbox.  Or, use the

option add *Listbox.exportselection false

command in the beginning of your script.

Thanks to David Herron  for this tip.