I've recently contacted Wikia staff regarding the disappearance of our chat hacks. They managed to fix them for us, so everything should work fine again. If this isn't the case for you, feel free to let me know.
For those unaware of what chat hacks are:
Chat hacks are extra features within our chat to improve the user comfort. This includes, but is not limited to, a ping sound when someone says your name. Chat hacks can be activated by entering chat, and then clicking "options" on the right above the names of the other users in chat at that time. Then under the "added functionality", you check the "enable chathacks" box. Click update. To get ping sounds when certain words or your name is said, click on "ping phrases" at the top of the chat, and add there whatever text you want to ping you.