Ghostscript's -dPDFDEBUG option pointed to an operation in the page
description that sets the line width to the string "2", which is
nonsensical. When I manually edited that to be the number 2, Adobe
Reader displayed the file. Does the source code by any chance include
something like this:
plot(..., lw='2')
If so, the solution would be to add some type checks in the backend
(and possibly in the frontend). If not, there must be a stranger bug
somewhere in the matplotlib innards.
···
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Jouni K. Sepp�nen
http://www.iki.fi/jks