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The culprit has proved to be the last line of this function, which I

commented out in my config:

(defun org-eval-in-calendar (form &optional keepdate)

    "Eval FORM in the calendar window and return to current window.

Also, store the cursor date in variable org-ans2."

    (let ((sf (selected-frame))

          (sw (selected-window)))

      (select-window (get-buffer-window "*Calendar*" t))

      (eval form)

      (when (and (not keepdate) (calendar-cursor-to-date))

        (let* ((date (calendar-cursor-to-date))

               (time (encode-time 0 0 0 (nth 1 date) (nth 0 date) (nth 2 date))))

          (setq org-ans2 (format-time-string "%Y-%m-%d" time))))

      (move-overlay org-date-ovl (1- (point)) (1+ (point)) (current-buffer))

      (select-window sw)

      ;; (org-select-frame-set-input-focus sf)

      ))

At least superficially, it would seem that with-current-buffer could be

used instead

Emacs  : GNU Emacs 24.2.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.10)

 of 2012-10-20 on ubuntu

Package: Org-mode version 7.8.11