Start `emacs -Q' and visit the attached file. Try to navigate with the
cursor keys to the cell A5. It is not possible. Other operations, such
as selecting rows, are broken too (try it with the 5 row).

Reverting ses.el to the version previous to 

Author: Stefan Monnier <monnier@iro.umontreal.ca>
Date:   Sun Jun 15 00:10:40 2014 -0400

    * lisp/ses.el: Miscellaneous cleanups; use lexical-binding; avoid add-to-list.
[long list of changes elided]


fixes the problem.