I've just installed yt on an Intel Mac and am trying to follow the examples for time series plots with iyt. When the pylab.plot statement is executed, the python plot window appears and python hangs (spinning beachball cursor). If I wait long enough a plot eventually shows up but python is still hung. This appears to be a known problem with the Enthought python distribution. (See https://svn.enthought.com/epd/ticket/186 .) I have verified that I get the same behavior using ordinary ipython rather than iyt. Happily there is also a known solution for ipython: simply invoke ipython with the -whtread option. I have tried this and it solves the problem--- in ipython. My question now is how to do the same thing for iyt. Is there a build option somewhere, so that iyt will start ipython with the -wthread flag?