NSLog();

Bit of a brain fart today. I've been annoyed since Mavericks shipped when "Space 3" would keep constantly arranging itself second in the list of (three) Spaces. Finally, today after looking at something related to Spaces did I see this second checkbox and uncheck it:

I'm not sure why anyone would ever want to have Spaces rearranging themselves, but if you're like me and you've assigned things to specific Spaces and like to keep your Spaces in order, you'll want to make sure that checkbox is unchecked as well.