Recently I've noticed the function I had been using to do refresh had stopped working and I had to change to a simpler call.
I used to have:
(defun k/org-babel-refresh-inline-images ()
(org-display-inline-images nil t))
(add-hook 'org-babel-after-execute-hook 'k/org-babel-refresh-inline-images)
which had been recommended on the mailing list.
However, that stopped working and I've found:
(add-hook 'org-babel-after-execute-hook 'org-display-inline-images)
to work, but I'm not sure why the original stopped working. Presumably, the original version might be more efficient if it worked. Why doesn't it, and why was the original preferred?