latex formatting of matplotlib labels seems to be broken?

Question

I am running a notebook that worked last time I logged into DataLab, but now am getting the following error when trying to plot using matplotlib.pyplot:

"RuntimeError: Failed to process string with tex because dvipng could not be found"

Any idea what has recently changed that would have made matplotlib unable to locate latex/dvipng?

Comments

Here are the contents of the cell I am trying to execute:

params = {
   'axes.labelsize': 20,
   'font.size': 20,
   'legend.fontsize': 14,
#   'xtick.labelsize': 16,
   'xtick.major.width': 3,
   'xtick.minor.width': 2,
   'xtick.major.size': 8,
   'xtick.minor.size': 5,
   'xtick.direction': 'in',
   'xtick.top': True,
   'lines.linewidth':3,
   'axes.linewidth':3,
   'axes.labelweight':3,
   'axes.titleweight':3,
   'ytick.major.width':3,
   'ytick.minor.width':2,
   'ytick.major.size': 8,
   'ytick.minor.size': 5,
   'ytick.direction': 'in',
   'ytick.right': True,
#   'ytick.labelsize': 20,
   'text.usetex': True,
   'text.latex.preamble': r'\boldmath',
   'figure.figsize': [7,9]
   }

plt.rcParams.update(params)

#plt.plot(g0-i0,i0,'k.',alpha=0.01)
plt.plot(g0[star & cen]-i0[star & cen],i0[star & cen],'c.',alpha=0.2)
plt.ylim(25.8,16.8)
plt.xlim(-1,4)
plt.xlabel(r'$(g-i)_0$')
plt.ylabel(r'$i_0$')
plt.minorticks_on()

Answer 1

Actually, I logged out of DataLab and logged back in, and this problem went away. I'm guessing that my login was "stale," and my path wasn't set up correctly...

Comments

I can't explain why it previously might have worked, however 'dvipng' was not installed on the machine.  It was installed but I became distracted before replying so it's possible that you picked up the new binary afterwards.