• windows 7 x64
• python 3.4.2
• matplotlib 1.4.2

When doing the following, you get a nice plot:

import matplotlib.pyplot as plt
plt.plot([0,1,2,3,4], '.')
plt.show()

When doing the following, the plot window opens and has same axes etc. but you can't see any points:

import matplotlib.pyplot as plt
plt.plot([0,1,2,3,4], ',')
plt.show()

This worked at least with the same setup and matplotlib 1.4.0rc2

Can anyone confirm?