Board Thread:Support Requests - Getting Technical/@comment-25523075-20150730141011/@comment-4018164-20150730154734

It's due to the last piece of code in your MediaWiki:Common.js: The $ is used by jQuery, while the node.style.display property belongs to actual nodes- not to the returned elements array which jQuery uses. Therefore, you should replace your code with one of the following (there are other potions, but these would work just well):
 * Option #1


 * Option #2


 * Option #3

However, note that removing the AKA text for users might not be very good per the customization policy, so you should probably not use that (at least not site-wide).