What seems to be happening is those blocks are no longer special block, but
instead an export-block. If you change special-block to export block, then
it works for me with org-ref loaded.

I don't know why (or even how) org-ref would be changing that though.


On Wed, May 11, 2016 at 12:26 PM, Julien Cubizolles <j.cubizolles@free.fr>
wrote:

> #+BEGIN_SRC elisp
> (require 'package)
> (setq package-archives '(("ELPA" . "http://tromey.com/elpa/")
>                          ("melpa" . "http://melpa.milkbox.net/packages/")
>                          ("gnu" . "http://elpa.gnu.org/packages/")
>                          ("org" . "http://orgmode.org/elpa/")
>                          ("marmalade" . "
> http://marmalade-repo.org/packages/")
>                          ))
> (package-initialize)
> (require 'org-ref)
> (defun org-repair-export-blocks ()
>   "Repair export blocks and INCLUDE keywords in current buffer."
>   (interactive)
>   (when (eq major-mode 'org-mode)
>     (let ((case-fold-search t)
>           (back-end-re (regexp-opt
>                         '("HTML" "ASCII" "LATEX" "ODT" "MARKDOWN" "MD"
> "ORG"
>                           "MAN" "BEAMER" "TEXINFO" "GROFF" "KOMA-LETTER")
>                         t)))
>       (org-with-wide-buffer
>        (goto-char (point-min))
>        (let ((block-re (concat "^[ \t]*#\\+BEGIN_" back-end-re)))
>          (save-excursion
>            (while (re-search-forward block-re nil t)
>              (let ((element (save-match-data (org-element-at-point))))
>                (when (eq (org-element-type element) 'special-block)
>                  (save-excursion
>                    (goto-char (org-element-property :end element))
>                    (save-match-data (search-backward "_"))
>                    (forward-char)
>                    (insert "EXPORT")
>                    (delete-region (point) (line-end-position)))
>                  (replace-match "EXPORT \\1" nil nil nil 1))))))
>        (let ((include-re
>               (format "^[ \t]*#\\+INCLUDE: .*?%s[ \t]*$" back-end-re)))
>          (while (re-search-forward include-re nil t)
>            (let ((element (save-match-data (org-element-at-point))))
>              (when (and (eq (org-element-type element) 'keyword)
>                         (string= (org-element-property :key element)
>                                  "INCLUDE"))
>                (replace-match "EXPORT \\1" nil nil nil 1)))))))))
> #+END_SRC
>
> #+RESULTS:
> : org-repair-export-blocks
>
> #+BEGIN_LATEX
> \begin{equation*}
> P_{ext} = P_0
> \end{equation*}
> #+END_LATEX
>



John

-----------------------------------
Professor John Kitchin
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803
@johnkitchin
http://kitchingroup.cheme.cmu.edu