[Ifeffit] Demeter: Problem closing communication to gnuplot

Hello, I am trying to learn to use Demeter following The Demeter Programmer Guide. When I attempt to run the first example script in the importing data section I get the following error message: Graphics::GnuplotIF (object 1): problem closing communication to gnuplot I also see the plot window flash open and then closed on my screen. I am using perl 5.16.1 on mac OSX 10.8.5. If anyone can provide any suggestions as to how I might correct this please let me know. Thank you, George