User blog comment:Sannse/Your First Look at the New Wikia/@comment-824313-20100903123228/@comment-174.7.79.252-20100903125018

That's because monaco is the default skin (wgSkin) and any value of useskin that is invalid will just be ignored. eg http://community.wikia.com/wiki/User_blog:Sannse/Your_First_Look_at_the_New_Wikia?&useskin=poppet

The skin is only live if you have the cookie and are viewing oasis.