WebAgg fails to start on Windows 7 with v1.4.2

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I am using:

• Anaconda Python 2.7.8 64 bit
• Matplotlib 1.4.2
• Firefox 34, IE 11

I tried running this code:

import matplotlib
matplotlib.use('webagg')
import numpy as np
import matplotlib.pyplot as plt

fig = plt.figure()
ax = fig.add_subplot(111)
ax.plot(np.random.rand(10))


def onkeyevent(event):
    fig.suptitle('%s: %s' % (event.name, event.key))
    fig.canvas.draw()

cid = fig.canvas.mpl_connect('key_press_event', onkeyevent)
cid = fig.canvas.mpl_connect('key_release_event', onkeyevent)
plt.show()

I get the error:

Press Ctrl+C to stop WebAgg server
ERROR:tornado.application:Uncaught exception in /1/ws
Traceback (most recent call last):
  File "C:\Users\silvester\Anaconda\lib\site-packages\tornado\websocket.py", lin
e 369, in _run_callback
    callback(*args, **kwargs)
  File "C:\Users\silvester\Anaconda\lib\site-packages\matplotlib\backends\backen
d_webagg.py", line 229, in on_message
    manager.handle_json(message)
  File "C:\Users\silvester\Anaconda\lib\site-packages\matplotlib\backends\backen
d_webagg_core.py", line 426, in handle_json
    self.canvas.handle_event(content)
  File "C:\Users\silvester\Anaconda\lib\site-packages\matplotlib\backends\backen
d_webagg_core.py", line 244, in handle_event
    self.draw()
  File "C:\Users\silvester\Anaconda\lib\site-packages\matplotlib\backends\backen
d_webagg_core.py", line 142, in draw
    self.manager.refresh_all()
  File "C:\Users\silvester\Anaconda\lib\site-packages\matplotlib\backends\backen
d_webagg_core.py", line 430, in refresh_all
    diff = self.canvas.get_diff_image()
  File "C:\Users\silvester\Anaconda\lib\site-packages\matplotlib\backends\backen
d_webagg_core.py", line 199, in get_diff_image
    self._png_buffer)
IndexError: Unexpected SeqBase<T> length.

I would have been using the development version but I could not get matplotlib-winbuild to work (separate issue)....

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I think my Anaconda was borked, I'm nuking it and starting over.

[blink1073]

False alarm, it works with a clean install.