The PGF backend of MPL 1.4.3 causes a "Dimension too large" LaTeX error when processing a log-scale plot with a point at zero. The error is

[...]! Dimension too large.<to be read again>                    \pgf@y l.69 ...\pgfqpoint{-2148537.332542in}{0.600000in}}                                                  %No pages of output.Transcript written on figure.log.

Obviously, thex coordinate of the point is way out of bounds. The script triggering the error is

importmatplotlibasmplmpl.use('pgf')importmatplotlib.pyplotaspltfig,ax=plt.subplots()ax.plot([0,1], [.5,1])ax.set_xscale('log')fig.savefig('fig.pdf')

Addingnonposx='mask' to the call toset_xscale prevents the error but produces a plot consisting of only a single point. The PGF version installed is 2.10 but the error also occurs with PGF 3.00.