User blog comment:Rappy 4187/Technical Update: August 31, 2015/@comment-24473195-20150831233511/@comment-24473195-20150901053452

"Not entirely sure what you mean at the end there. When editing JS pages, it shows up in the js editor even if you have source editor enabled in your preferences."

Oh, I meant that there is a good chance that users of these wikias with Javascript problems use the classic editor/rich text editor (Old gui editor before visual editor). So the BETA Visual Editor not working wouldn't really affect them, and in some cases they could be oblivious to that fact.

Lately, I've seen a couple of users and admins complaining in the forum about it not working, and it is always caused by javascript errors (see http://community.wikia.com/wiki/Thread:822694 ).

This could also be a bug with visual editor itself, because visual editor seemed to work before (even with js errors), and that changed after a particular update.