When you have a redirect page in the File: namespace and try to view a diff of it's history, such as in the url, then only the redirect arrow and target are shown, not the page diff.
Version: 1.17.x
Severity: normal
URL: http://en.wikipedia.org/w/index.php?title=File%3ACovernt1.jpg&action=historysubmit&diff=366854526&oldid=366854323