Last modified: 2013-06-23 19:14:11 UTC
See https://en.wikipedia.org/w/index.php?title=Breast_cancer&diff=558696523&oldid=558695500 and https://en.wikipedia.org/w/index.php?title=Downward_causation&diff=prev&oldid=558735268 for example; I have...no idea what's happening.
I think that we've fixed this bug, but if it recurs please re-open.