When I first attached my new A7R to my new MacBook it would not connect at all. I then tried it on my older iMac and the Live View set to USB PC Remote worked. After several contacts with Apple, Sony and Phase One (Capture One), I installed new A7R firmware and Remote Camera Control software. I finally got it to work on the Macbook BUT no Live View, just tether. I then tried it again on the iMac and it no longer worked???
Only after several hours of trial and error what I ended up with is that I can tether the A7R in Capture One but no Live View - its not supported for this.
I got this camera specifically to shoot tethered and have Live View in Capture One. So after spending a lot on hardware and software all I got was tether. I already had that with Lightroom for Hasselblad but Sony is not supported by Adobe.
All this proprietary stuff is complete nonsense and a waste of time. Welcome to the 21st century - Not!
Very disappointed with Sony, Phase One and Lightroom.
I really regret having made these investments.