Mask and tracking not working

Hi there, I have an issue trying to make the mask & track new feature to work. I draw the mask and when I press track it won't make any progress. I can still track frame by farm by clicking on the next frame arrow but obviously that's not the way I want to do it as it takes me ages.

This new feature will really streamline my workflow and I'm finding it quite frustrating to make it work.

I'm working on 1080p 25fps on Apple Pro Res 4.2.2 and have also try to used DSLR footage with no luck either. Using a Mac Pro on Mavericks

Thanks