On Sun, 24 Jan 2016, Achim Gratz wrote:

>
> This is probably caused by an update of ESS rather than some change in
> Org,

Nope. I failed to let bind ess-ask-for-ess-directory in adding a test a 
few days ago.

Fixed in commit 27b590c39551f9aae79d801f61125cbaf1bd896c.

>
> Cannot read history file […]/org-mode/testing/examples/.Rhistory
>
> in the testing output.  Someone who actually uses ESS on a regular basis
> needs to decide the appropriate course.
>

Now fixed by binding `ess-history-file' to nil.

Thanks,

Chuck