Board Thread:Support Requests - Designing Your Wikia/@comment-1440567-20140607214231/@comment-856287-20140608040802

....aaaand after writing all that out, I realized you copied the styles from Common.css into Wikia.css and still doesn't work.

That's when I found this: …lol… sadfase… You can modify the use of the various CSS files as I described… or not… but you do need to change that ")" to "}"

The reason it still works with the error on one wiki and not the other is you had a duplicate of the styles being concatenated from Common.css at the top (before the error occurred and nullified all remaining styles below it). That concatenation wasn't happening on the older/real wiki, so the redundant style wasn't there to cover up the error.