Tkinter's Text widget has a method edit_modified()
which should return True if the modified flag of the
widget has been set, False otherwise.  It should also
be possible to pass True or False into the method to
set the flag to a desired state.  The implementation
retrieves the correct value, but then calls
self._getints( result ).  This causes an exception to
be thrown.

In my build, I found that changing the implementation
to the following appears to fix the function.

  return self.tk.call( self._w, 'edit', 'modified', arg )