Getting blitting to work in funcAnimation embedded in PyQT4 GUI

Starting with the working Matplotlib animation code shown below, my goal is to embed this animation (which is just a circle moving across the screen) within a PyQT4 GUI.

import matplotlib.pyplot as plt
from matplotlib.patches import Circle
from matplotlib import animation

fig,ax = plt.subplots()
ax.set_aspect('equal','box')
circle = Circle((0,0), 1.0)
ax.add_artist(circle)
ax.set_xlim([0,10])
ax.set_ylim([-2,2])

def animate(i):
    circle.center=(i,0)
    return circle, 

anim = animation.FuncAnimation(fig,animate,frames=10,interval=100,repeat=False,blit=True)

plt.show()

I am able to accomplish this using the following code, but there is one hitch: I cannot get blitting to work.

import sys
from PyQt4 import QtGui, QtCore
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
from matplotlib.patches import Circle
from matplotlib import animation

class Window(QtGui.QDialog): #or QtGui.QWidget ???

    def __init__(self):
        super(Window, self).__init__()
        self.fig = Figure(figsize=(5,4),dpi=100)
        self.canvas = FigureCanvas(self.fig)
        self.ax = self.fig.add_subplot(111)  # create an axis
        self.ax.hold(False)  # discards the old graph
        self.ax.set_aspect('equal','box')
        self.circle = Circle((0,0), 1.0)
        self.ax.add_artist(self.circle)
        self.ax.set_xlim([0,10])
        self.ax.set_ylim([-2,2])
        self.button = QtGui.QPushButton('Animate')
        self.button.clicked.connect(self.animate)

        # set the layout
        layout = QtGui.QVBoxLayout()
        layout.addWidget(self.canvas)
        layout.addWidget(self.button)
        self.setLayout(layout)

    def animate(self):
        self.anim = animation.FuncAnimation(self.fig,self.animate_loop,frames=10,interval=100,repeat=False,blit=False)
        self.canvas.draw()

    def animate_loop(self,i):
        self.circle.center=(i,0)
        return self.circle, 

def main():

    app = QtGui.QApplication(sys.argv)
    ex = Window()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()  

When I set blit=True, after pressing the Animate button I get the following error: a.figure.canvas.restore_region(bg_cache[a]) KeyError: matplotlib.axes._subplots.AxesSubplot object at 0x00000000095F1D30

In searching this error, I find many posts about how blitting does not work on Macs, but I am using Windows 7. I have tried replacing self.canvas.draw() with self.canvas.update(), but this does not work.