Campaign sent to 0 recipients

I have the latest version of Sendy: Version 2.0.3
As of last week newsletters were being sent perfectly.

We have set up 2 tests at the moment, both of which Sendy says the campaign was successfully sent (sent 17mins ago), however the recipients is 0: http://awesomescreenshot.com/0584xxb96c

A test email works without a hitch.

Server OS: Centos 6.6 running C-Panel.

Any help would be greatly appreciated as we are trying to send our a campaign today.