Hello Jim.
I Have a Mackbook Pro 17, early 2011, too and
I’m thinking to buy the Blackmagic Ultra-Studio 4K 2.
I want to Connect the Blackmagic US to the Thunderbolt-
Connection of my Macbook and a DVI-Display via
an Adapter to the 2nd Thunderbolt-Port on the Ultrastudio.
Did you check if that works?
Would help me a lot.
Thanks
Soeren