User blog comment:Kirkburn/Technical Update: March 3, 2015/@comment-1764483-20150305151704/@comment-126761-20150307173656

It was an unintended result of a VolDev fix (which unfortunately missed this week's notes) - essentially the fix corrected a link on Profile page diff pages (it pointed to talk pages on wikias with Message Wall enabled), but it unintentially affected some other links as well. The fix should be pretty easy, and hopefully should be included in next week's release.