Screen Source Issue

I am trying to use a screen source but the set area comes up filled as green. I can not work out why? I have had this working on other machines and set ups? Any help appreciated.

Mac Book Pro Retina, NVIDIA GeForce GT 650M 1024 MB

What version of BoinxTV and OS X are you running?

Problem solved, after some google searching all I needed to do was to repair disk permissions? go figure?