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Bug report

Bug summary
Interactive code example from documentation produces hanging/unresponsive window, frequently stuck behind other windows.

Code for reproduction
from matplotlib documentation here

#backend set to TkAgg, others also error...
import matplotlib.pyplot as plt
plt.ion()
plt.plot([1.6, 2.7])

Actual outcome

Figure window appears, is unresponsive and no plot is shown. Figure cannot be moved, will go to background (cmd tab will not bring window to top). Within seconds the cursor becomes unresponsive "beachball" when over the figure window.

Expected outcome

A (non hanging, cmd-tabbable) plot window with something plotted. This error has persisted for some time.

Matplotlib version

• Matplotlib 1.5.1 (latest with conda update matplotlib), python 2.7.11 (anaconda distr.), macos 10.12.4