Bug report

A 3D line plot is created and pickled for reloading later. Loading the plot later results in a plot that cannot be interacted with.

Code for reproduction

import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D
import pickle as pk
import numpy as np

plt.ioff()

t = np.linspace(0, 6*np.pi, 1000)
x = np.sin(t)
y = np.cos(t)
z = t/100

fig = plt.figure()
ax = fig.add_subplot(111, projection='3d')
ax.plot(x, y, z, label='3d plot')

fo = open('test_file.pkl', 'wb')
pk.dump(fig, fo)
fo.close()

In a different python instance

import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D
import pickle as pk

plt.ioff()

fi = open('test_file.pkl', 'rb')
fig = pk.load(fi)
fi.close()

fig.show()

The figure is shown, but cannot be interacted with.

Expected outcome
The figure would be shown and the plot could be interacted with to show a different view.

Matplotlib version

• Operating system: Win7
• Matplotlib version: 2.1.2
• Matplotlib backend: Qt5Agg
• Python version: 3.6.4
• Jupyter version (if applicable): N/A
• Other libraries: iPython 6.2.1, Spyder 3.2.6

matplotlib installed by Anaconda from default channel.