I got a reply from the theme designer, but I think it may be wrong, could you clear this up please so I can rule it out?
Checking the php snippet that you are trying to use brought me here: http://wordpress.org/extend/plugins/datafeedr-ads/
It says: HIS PLUGIN HAS BEEN DEPRECATED. WE'VE RELEASED A BRAND NEW VERSION OF THIS PLUGIN. THE NEW PLUGIN HAS MANY MORE FEATURES! CHECK IT OUT HERE: http://wordpress.org/extend/plugins/...-datafeedrcom/
Have you tried the new plugin?
but I don't use that plugin, so I don't think that's relevant to me. I use the main one, Version 3.11.5013.
Is that snippet I am using somehow tied to the ads plugin?