[O] Error when exporting LaTeX

[Peter Davis]

I'm writing a fairly simple document with some #+BEGIN_SRC/#+END_SRC
blocks, and when I try to export to LaTeX/PDF, I get:

org-latex-src-block: Wrong type argument: stringp, nil

Does this ring any bells? I can try to cobble together a "neutralized"
sample to reproduce the problem, but I thought I'd see if anyone
recognized it.

Thanks,
-pd