orange connection light in Traktor

Hi All,

At the top f the Traktor pro screen, there are the little indicators for your audio interface and controllers - blue if they're connected fine and orange for 'not all connected'

i have 2 X1 controllers connected to my macbook pro via a hub, they work fine but the light is orange on screen, i just wondered if there is any reason for this?
As i say they work fine, but it just concerns me that tractor believes they're not all connected. The light should be blue right?

Thanks for any help and advice,

Tom