Re: viewnx2
Do you have the latest version of ViewNX installed. You can download it from Nikon's Web site. The current version is 2.7.6. If you don't have that version, I would suggest you download and install it.
When you plug your camera in, open up Finder and see if the camera is displayed under "Devices" on the left side of the Finder window. Check your preferences and settings for Finder and be sure it does not have Devices set to hidden.
One in a while, I have had a problem of my MacBook Pro not seeing a USB device. When that happens, I unplug it, plug it back in and in a few seconds, it shows up.
Hope that helps.