[I also posted this at the Technical Update blog, but seems relevant here too]
Since the system update today, I have been getting constant complaints from users that Header 3 titles are no longer appearing in Tables of Contents. I myself saw this bug for a few seconds but it cleared up quickly (I am switching between Safari and Firefox browsers, and both seem fine). Others are apparently experiencing the problem more persistently. I am advising that they contact Wikia directly about it. I am hoping this issue gets ironed out soon, as I'm getting tired of fielding complaints about it (we are in the busy season for academic jobs). My wiki is http://academicjobs.wikia.com/wiki/Academic_Jobs_Wiki If there is some other approach or fix that can be recommended, I would love to hear it. Thanks!