User blog comment:DaNASCAT/Technical Update: October 23, 2012/@comment-3441771-20121024031444

&ldquo;The gutter parameter is no longer supported for main page column tags. Gutter width is set at 10 pixels and can be changed using CSS if needed.&rdquo;

If only this was Wikia moving away from outdated attributes. However, it's much more likely that Wikia just cannot be bothered to fix this for MW 1.19. Please tell me I'm wrong... :P