User blog comment:Sactage/Technical Update: July 23, 2013/@comment-3441771-20130724100945/@comment-452-20130724165105

Is this related to .oasis-split-skin?

I noticed that class was removed, so I updated the CSS to compensate, now the class has been re-added.

I wasn't going to mention it, because you're entitled to change whatever classes you like, and if it interferes with local CSS, then that's my problem, not yours, but changing things backwards and forwards like this is annoying.