I noticed that on a default install (just running install_script.sh), yt issues warnings about not having access to readline:

WARNING: Readline services not available on this platform.
WARNING: The auto-indent feature requires the readline library

Inside the yt env, I ran this:

$ pip install -U ipython
$ pip install readline

and everything is good now. I'm guessing this just means some simple mods to install_script.sh, but this works for now.

Best,
Casey