Hello,
Thank you for your patience.
Did you try updating your D6000 firmware? If not, please follow
this link and perform the update.
Please note down that the upgrade can be only done on the
Windows machine. You will simply need to connect the docking station (without the external screens) to the Windows machine and perform the update. Afterwards, plug in the dock to the Macbook and verify.
Thank you for your actions.
Kind regards,
Jakub