(yt-x86_64)Hermione:~ madisonfitzgerald$ yt update --all
Traceback (most recent call last):
  File "/Users/madisonfitzgerald/yt-x86_64/bin/yt", line 9, in <module>
    load_entry_point('yt==3.2', 'console_scripts', 'yt')()
  File "build/bdist.macosx-10.4-x86_64/egg/pkg_resources/__init__.py", line 558, in load_entry_point
  File "build/bdist.macosx-10.4-x86_64/egg/pkg_resources/__init__.py", line 2682, in load_entry_point
  File "build/bdist.macosx-10.4-x86_64/egg/pkg_resources/__init__.py", line 2355, in load
  File "build/bdist.macosx-10.4-x86_64/egg/pkg_resources/__init__.py", line 2361, in resolve
  File "/Users/madisonfitzgerald/yt-x86_64/src/yt-hg/yt/__init__.py", line 146, in <module>
    from yt.visualization.api import \
  File "/Users/madisonfitzgerald/yt-x86_64/src/yt-hg/yt/visualization/api.py", line 22, in <module>
    from .particle_plots import \
  File "/Users/madisonfitzgerald/yt-x86_64/src/yt-hg/yt/visualization/particle_plots.py", line 24, in <module>
    from .plot_window import \
  File "/Users/madisonfitzgerald/yt-x86_64/src/yt-hg/yt/visualization/plot_window.py", line 34, in <module>
    from .plot_modifications import callback_registry
  File "/Users/madisonfitzgerald/yt-x86_64/src/yt-hg/yt/visualization/plot_modifications.py", line 26, in <module>
    from mpl_toolkits.axes_grid1.anchored_artists import AnchoredSizeBar
  File "/Users/madisonfitzgerald/yt-x86_64/lib/python2.7/site-packages/matplotlib-1.4.3-py2.7-macosx-10.4-x86_64.egg/mpl_toolkits/axes_grid1/__init__.py", line 9, in <module>
    from .axes_grid import Grid, ImageGrid, AxesGrid
  File "/Users/madisonfitzgerald/yt-x86_64/lib/python2.7/site-packages/matplotlib-1.4.3-py2.7-macosx-10.4-x86_64.egg/mpl_toolkits/axes_grid1/axes_grid.py", line 8, in <module>
    import matplotlib.pyplot as plt
  File "/Users/madisonfitzgerald/yt-x86_64/lib/python2.7/site-packages/matplotlib-1.4.3-py2.7-macosx-10.4-x86_64.egg/matplotlib/pyplot.py", line 109, in <module>
    _backend_mod, new_figure_manager, draw_if_interactive, _show = pylab_setup()
  File "/Users/madisonfitzgerald/yt-x86_64/lib/python2.7/site-packages/matplotlib-1.4.3-py2.7-macosx-10.4-x86_64.egg/matplotlib/backends/__init__.py", line 32, in pylab_setup
    globals(),locals(),[backend_name],0)
  File "/Users/madisonfitzgerald/yt-x86_64/lib/python2.7/site-packages/matplotlib-1.4.3-py2.7-macosx-10.4-x86_64.egg/matplotlib/backends/backend_macosx.py", line 24, in <module>
    from matplotlib.backends import _macosx
ImportError: cannot import name _macosx