Problem with loglog and ls='steps'

Hi,

I have a problem with the loglog function with ls='steps' (matplotlib version: 0.98.3). When I try to plot arrays with loglog(x,y,ls='steps'), nothing is drawn whereas loglog(x,y) and plot(x,y,ls='steps'):

x=[10.,20.,30.,40.,50.]
y=[0.09,0.02,0.02,0.03,0.01]
pylab.loglog(x,y) #it works
pylab.loglog(x,y,ls='steps') #nothing is drawn...
pylab.plot(x,y,ls='steps') #it works

Is there something I can do to use loglog with ls='steps'?

thanks in advance,
Nicolas