New Zero Hour maps not working?

Hi guys,

I've downloaded a bunch of new Zero Hour maps and extracted them into the ZH > Data > Maps folder as directed. Apparently, the new maps are supposed to show up in the 'Unofficial Maps' tab once you're selecting what map you want to play your opponent(s) against - except, this tab is blank when I click on it and the new maps are nowhere to be seen.

What am I missing here? 

Any help would be greatly appreciated.

Cheers,