problems with Qt5 backend?

The following script runs fine with pyqt version 4 but not version 5. With
Qt5 the interactive plot window is too small, but the text remains at the
size that would be correct for a larger properly sized window. I'm running
Qt5 with the latest Anaconda installation on a Mac. Is this a problem with
the matplotlib backend for Qt5? By the way, the version of the plot saved
to the file text.pdf is correctly sized.

from matplotlib.backends.backend_qt5agg \

import FigureCanvasQTAgg as FigureCanvas

from matplotlib.figure import Figure

fig = Figure(figsize=(6, 4))

canvas = FigureCanvas(fig)

ax = fig.add_subplot(111)

ax.plot([1, 2, 3, 2, 3, 4, 3, 4, 5])

ax.set_title('A simple plot')




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