Thanks John. Here's a small org file:

>>>>>>>>>>>>>>>>>>>>>

#+TITLE: Sample Doc

#+AUTHOR: Ken Williams

#+EMAIL: kenahoo@gmail.com

#+DATE: 2013-01-21

#+PROPERTY: results output

#+PROPERTY: exports both

#+LATEX_HEADER: \usepackage{amsmath}

#+begin_src R

5+5

#+end_src

#+RESULTS:

: [1] 10

<<<<<<<<<<<<<<<<<<<<<

The code gets exported to:

>>>>>>>>>>>>>>>>>>>>>

5+5
</pre>

<pre class="example">
[1] 10
</pre>

<<<<<<<<<<<<<<<<<<<<<

And here's my config:

>>>>>>>>>>>>>>>>>>>>>

(custom-set-variables

;; custom-set-variables was added by Custom.

;; If you edit it by hand, you could mess it up, so be careful.

;; Your init file should contain only one such instance.

;; If there is more than one, they won't work right.

'(current-language-environment "UTF-8")

'(global-font-lock-mode t nil (font-lock))

'(inhibit-splash-screen t)

'(org-alphabetical-lists t)

'(org-export-html-postamble nil)

'(org-export-html-preamble-format (quote (("en" "<p class=\"author\">Author: <a href=\"mailto:%e\">%a</a></p>

"))))

'(org-src-preserve-indentation t)

'(show-paren-mode t)

'(tool-bar-mode nil)

'(transient-mark-mode t)

'(user-mail-address "kenahoo@gmail.com"))

(custom-set-faces

;; custom-set-faces was added by Custom.

;; If you edit it by hand, you could mess it up, so be careful.

;; Your init file should contain only one such instance.

;; If there is more than one, they won't work right.

'(diff-added-face ((t (:foreground "green"))))

'(diff-changed-face ((t (:foreground "blue" :slant italic :weight bold))))

'(diff-removed-face ((t (:foreground "red"))))

)

(setq

backup-by-copying t ; don't clobber symlinks

backup-directory-alist

'(("." . "/tmp/")))

(add-to-list 'load-path "~/share/emacs/site-lisp/org" load-path)

(require 'org-install)

(add-to-list 'auto-mode-alist '("\\.org$" . org-mode))

(global-set-key (kbd "M--") 'ess-smart-underscore)

(org-babel-do-load-languages

'org-babel-load-languages

'((emacs-lisp . t)

(sh . t)

(R . t)

(perl . t)))

(setq org-export-html-style

"<style type=\"text/css\">

<![CDATA[/*><!--*/

.src { background-color: #F5FFF5; position: relative; overflow: visible; margin-right: auto; }

.src:before { position: absolute; top: -15px; background: #ffffff; padding: 1px; border: 1px solid #000000; font-size: small; }

.src-sh:before { content: 'sh'; }

.src-bash:before { content: 'sh'; }

.src-R:before { content: 'R'; }

.src-perl:before { content: 'Perl'; }

.src-java:before { content: 'Java'; }

.src-sql:before { content: 'SQL'; }

.example { background-color: #FFF5F5; }

/*]]>*/-->

</style>")

(setq org-export-babel-evaluate nil)

(setq org-confirm-babel-evaluate nil)

<<<<<<<<<<<<<<<<<<<<<

-Ken

On Sun, Jan 20, 2013 at 11:36 PM, John Hendy <jw.hendy@gmail.com> wrote:

On Sun, Jan 20, 2013 at 10:57 PM, Ken Williams <kenahoo@gmail.com> wrote:
>
> On Sun, Jan 20, 2013 at 9:15 PM, Eric S Fraga <e.fraga@ucl.ac.uk> wrote:
>>
>> Ken Williams <kenahoo@gmail.com> writes:
>>
>>> Unfortunately, downgrading to 7.8.11 didn't change the behavior - all
>>> code sections are still exported to HTML as class "example".
>>> I also see that on one machine, using 7.9.2, I get the desired <pre
>>> class="src src-R"> tag for R code export. I can't figure out what's making
>>> the difference though.
>>
>>
>> I'm grasping at straws here, having seldom exported to HTML, but have you
>> loaded the languages for babel?
>
>
> Yes, I believe that's set up properly, because I can do "C-c C-c" and it
> knows how to run my R sections and return the correct values. Also, when I
> "describe org-babel-load-languages", I see:
>
> org-babel-load-languages is a variable defined in `org.el'.
> Its value is ((emacs-lisp . t)
> (sh . t)
> (R . t)
> (perl . t))
>
> I'm grasping at straws too, not knowing my way around the elisp code very
> well. =)

Just tried myself on a file lying around with embedded R code, and I
get "<pre class="src src-R">" for my src blocks.

Can we back up a bit and have you post a minimal config and sample
file? Perhaps the output of =M-x org-version= as well, just to be sure
on where emacs is pulling org code from? You might have done this; my
apologies if so. Been following the thread from a distance as I didn't
have much experience with html/src code export. Just thought I'd chime
in on things I've been asked to do that usually do help the situation.

With a minimal config (like your load directories and the babel
language definitions above), we can try to replicate a bit better.
Emacs configs get long, so it's really hard to know from user to user
what else might be going on.

Thanks!
John

>
> -Ken