I updated my packages today and now Org documents with R source blocks are 
failing when I try to use a running R session.

If you start R and leave that session open, then run this in an Org doc, it will 
fail (though it will success without the :session parameter):

#+BEGIN_SRC R :session :results values
1
#+END_SRC

The error I get (which includes a lot of junk I can't paste; why, I don't know) 
is

ess-eval-buffer: Wrong number of arguments: #[(start end toggle &optional 
message) ... junk ... [ess-local-customize-alist toggle ess-eval-visibly message 
proc visibly ess-force-buffer-current "Process to use: " "Starting 
evaluation..." ess-setq-vars-local ...] 6 
("/home/wdenton/.emacs.d/elpa/ess-20160502.557/lisp/ess-inf.elc" . 48726) "r
P"], 5

Now, the most recent commit to lisp/ess-inf.el had the comment "Get rid of 
needless `inject` argument:"

https://github.com/emacs-ess/ESS/commit/6b89391a13322ff2297fb3895ed665ff2048fc10#diff-724cde45c58d919c6bb8e85b26faf792

Perhaps that is the cause?  I suspect it's Org talking to ESS, but if it's a 
problem in ESS I can take it to that mailing list.


Emacs  : GNU Emacs 25.1.50.29 (x86_64-unknown-linux-gnu, GTK+ Version 3.16.7)
  of 2016-05-03

Org-mode version 8.3.4 (release_8.3.4-771-g36dbdb @ 
/usr/local/src/org-mode/lisp/)

ess-version: 15.09-2 patched [elpa: 20160502.557] (loaded from 
/home/wdenton/.emacs.d/elpa/ess-20160502.557/)

Thanks,

Bill
-- 
William Denton ↔  Toronto, Canada ↔  https://www.miskatonic.org/