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amazon EC2 x11 problems

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http://serverfault.com – We are trying to set up a virtual development / research cloud environment for our students. Students need to be able to log-in, launch python IDE, and plot some graphs for their homework. We are running 64bit Ubuntu 12.10, with Python and IDLE ide installed. Students login with using ssh -X and launch IDLE, which spawns a GUI window. Problem: running something like this in the ide nltk.download() spawns a new window. BUT when we try something like this: book2.dispersion_plot("chair") Nothing happens, where we would expect a new window to spawn and show the plot (thats what happens on (HowTos)