Martin Schöön <martin.schoon@gmail.com> writes:

> On 7 May 2014 09:38, Eric S Fraga <e.fraga@ucl.ac.uk> wrote:
>

>     Note that you probably want

>     to have that customisation *after* loading org and ox-latex in particular.
>

                                 ^^^^^^^

I've taken the liberty to add some emphasis to Eric's comment: I think
you are trying to set the variable before loading the file where it is
defined.