Did some shootings with Nikon D810 in tethered mode LR 5.7. Camera Raw 8.7- all perfect. Suddenly, a week ago, from one frame to the other - LR didn't recognize the cam. And I've not been able to make it work until now. What can this be? On my PC it works, the laptop is connected to the cam and everything is fine - only lightroom doesn't recognize.
See this article:
What OS X version are you running? Have you updated the D810 firmware to latest the latest version? Have you shutdown the laptop, unconnected all USB devices, restarted and tried again? Have you tried other USB cables?