Patches that have a hatch pattern in EPS plots don't show the hatch pattern when opened in Preview on MacOS X. This may be a Preview bug rather than a Matplotlib bug, but I wanted to check whether anything can be done on the Matplotlib side to avoid this (since the likelihood Apple will care about this issue is minimal). This was not a problem with Matplotlib 1.5, only with 2.0, so in that sense this is a regression.

To reproduce this:

from matplotlib import pyplot as plt
from matplotlib.patches import Ellipse

fig = plt.figure()
ax = fig.add_subplot(1,1,1)
ell = Ellipse((0.5, 0.5), 0.3, 0.4, 30, hatch='/', facecolor='none', edgecolor='black')
ax.add_patch(ell)
fig.savefig('test.eps')

PNG:

EPS, as viewed in Preview on MacOS X:

The above is with Matplotlib 2.0. With 1.5, Preview correctly shows the hatch pattern:

I'm using MacOS X 10.11.6