Nikon Japan published a warning about a possible image data corruption in View NX-i when transferring images with Nikon Transfer 2 on macOS Sierra version 10.12.2. The latest ViewNX-i version 1.2.4 is compatible with macOS Sierra version 10.12 but it is not compatible with macOS Sierra version 10.12.1 or later and you should not use Nikon Transfer 2 until an update is released.