Macintosh users who like to tether their Nikons, take note. After digging into the problem of tethering no longer working with Nikon and Leica cameras following the Apple OS X release El Capitan, I have learned that Apple removed some low level access protocols for security reasons. I am in favour of security but am not in favour of serious functional breakage. Apple is allegedly working on a fix. In the interim, if tethering to Nikon or Leica is important to you, DO NOT UPDATE to El Capitan. This is an OS issue, not a Lightroom, Capture ONE, or Nikon Camera Control issue.