Board Thread:Off-Topic Discussion/@comment-25147000-20150320032731/@comment-32500188-20150516180814

^^ Are you using the new interface on the "Edit this page" button? If so, I'd say you're better off using the Classic Editor from the drop down menu of that button. That's more stable than the new article editor anyways, and the categories still work from there.

Personally, ever since they changed the default means of editing articles on wikia pages, I've had nothing but issues with it... maybe it was browser compatibility, maybe it was my inability to learn how it's supposed to work... but either way, I find it quicker and easier to use the old one when it comes to adding stuff like categories and templates.