I can't evaluate R code blocks in org files. For example the file with
contents:

--8<---------------cut here---------------start------------->8---
#+property: header-args:R :session R-foo

#+BEGIN_SRC R
  print(pi)
#+END_SRC
--8<---------------cut here---------------end--------------->8---

spawns an R session that reports:

--8<---------------cut here---------------start------------->8---
  Error: could not find function ".ess.eval"
--8<---------------cut here---------------end--------------->8---

and does not give me a result.
I am running ess-version: 14.09 and am invoking emacs as follows:

--8<---------------cut here---------------start------------->8---
#!/bin/sh

o=/usr/local/share/emacs/site-lisp/org
emacs -Q --eval="(progn
                  (add-to-list 'load-path \"$o\")
                  (require 'org)
                  (org-babel-do-load-languages
                   'org-babel-load-languages
                   '((R . t)))
                  (package-initialize)
                  (setq ess-ask-for-ess-directory 'nil
                        ess-directory \"~/R/\"))"
--8<---------------cut here---------------end--------------->8---

EdK

Emacs  : GNU Emacs 24.4.50.1 (i686-pc-linux-gnu, GTK+ Version 2.24.23)
 of 2014-08-23 on dl
Package: Org-mode version 8.3beta (release_8.3beta-362-ga92789 @ /usr/local/share/emacs/site-lisp/org/)

current state:
==============
(setq
 org-ctrl-c-ctrl-c-hook '(org-babel-hash-at-point
			  org-babel-execute-safely-maybe)
 org-tab-first-hook '(org-hide-block-toggle-maybe
		      org-babel-hide-result-toggle-maybe
		      org-babel-header-arg-expand)
 org-cycle-hook '(org-cycle-hide-archived-subtrees org-cycle-hide-drawers
		  org-cycle-hide-inline-tasks org-cycle-show-empty-lines
		  org-optimize-window-after-visibility-change)
 org-agenda-before-write-hook '(org-agenda-add-entry-text)
 org-speed-command-hook '(org-speed-command-default-hook
			  org-babel-speed-command-hook)
 org-babel-pre-tangle-hook '(save-buffer)
 org-occur-hook '(org-first-headline-recenter)
 org-metaup-hook '(org-babel-load-in-session-maybe)
 org-confirm-elisp-link-function 'yes-or-no-p
 org-clock-out-hook '(org-clock-remove-empty-clock-drawer)
 org-mode-hook '(#[nil "\300\301\302\303\304$\207"
		   [org-add-hook change-major-mode-hook org-show-block-all
		    append local]
		   5]
		 #[nil "\300\301\302\303\304$\207"
		   [org-add-hook change-major-mode-hook
		    org-babel-show-result-all append local]
		   5]
		 org-babel-result-hide-spec org-babel-hide-all-hashes)
 org-metadown-hook '(org-babel-pop-to-session-maybe)
 org-src-mode-hook '(org-src-babel-configure-edit-buffer
		     org-src-mode-configure-edit-buffer)
 org-after-todo-state-change-hook '(org-clock-out-if-current)
 org-babel-load-languages '((R . t))
 org-confirm-shell-link-function 'yes-or-no-p
 )