Arch Linux

Description:
When plotting scattered data with the "," marker, the data points do not show up either on screen (Qt4Agg backend) or in saved bitmap images (tested with png); they do show up if the plot is exported as pdf.

Additional info:
* package version(s)
community/python-matplotlib 1.4.2-3
community/ipython 2.3.1-1
community/python-scipy 0.14.1-1

* config and/or log files etc.
The only thing set in ~/.config/matplotlib/matplotlibrc is
backend : Qt4Agg
interactive : True

Steps to reproduce:
Start python:
$ ipython --pylab
In ipython: Create data and plot (500 randomly scattered points)

import numpy as np
a = np.random.standard_normal(500)
b = np.random.standard_normal(500)
plot(a,b,',')
savefig("testplot.png")
savefig("testplot.pdf")

Expected result: Scatter plot of random data points, both on screen and in saved files.

Actual result: Empty-looking plot both on screen and in png, but plot as expected in pdf.