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