Anyone running Gnuplot on a Mac?

[Dave Horsfall]

Something suddenly busted here; my spam graph is utterly weird now, and I was
wondering whether it was anything that I did...

See www.horsfall.org/spamlog.pdf for yesterday's graph (nice and pretty!) 
and www.horsfall.org/spamlog-busted.pdf (where the hell did my log scale 
on the left go?).

Command and datafile available if anyone can try it; they aren't all that
large...

I wonder if yesterday's upgrade to Macports 2.5.0 had anything to do with 
it?  I did reinstall Gnuplot, but nope...

Or did I forget to RTFM again :-(

Ta muchly.

-- Dave