It seems that at some point in the last few months a change was made that means that the following code no longer works properly:
import matplotlib as mpl
import matplotlib.pyplot as plt
import numpy as np
fig = plt.figure()
ax = fig.add_axes([0.1,0.1,0.3,0.3])
This produces a file that does not have the right bounding box (it's as if I wasn't specifying bbox_inches=True). Can anyone else reproduce this issue? If so, I'll open a ticket.