Several contributors have encountered pages whose content seems to be missing, displaying only an empty blue area where the content used to be and the bar with the categories. To fix this add
?action=purge to the end of the URL, like this:
http://bioshock.wikia.com/wiki/BioShock_Wiki?action=purge. This will refresh the page by reloading it completely.
There are tools available to make this easier. PurgeButton, for example adds a button to the edit menu, allowing to purge a page more easily. To add this tool, go to Special:Mypage/wikia.js and create a page with
importScriptPage('PurgeButton/code.js', 'dev'); as content. If you want to use this tool on all the wikis on Wikia, go to w:special:Mypage/global.js.