From mboxrd@z Thu Jan  1 00:00:00 1970
From: Vincent Beffara <vbeffara+ml@gmail.com>
Subject: Re: Problem with org-html-format-latex
Date: Mon, 11 Feb 2013 22:44:36 +0100
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To: Bastien <bzg@altern.org>
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> > so simply testing
> > on the value of processing-type would work better, maybe?
> 
> Yes, should be okay now, let me know!

Nope, exactly the same. cache-relpath and cache-dir are not allowed to be nil. Meaning that if processing-type is 'mathjax they should be set to _some_ string anyway (the contents will be ignored eventually, but far down the line unfortunately ...) Something like instead of your 'let' line works:

(let ((cache-relpath "") (cache-dir "") bfn)

/v