No Mac serial ports

OK. I have tried to uploading the example Blink sketch to my new Due, using 4 different approaches, using 3 different computers, and they all involve a port problem. Each time, Arduino 1.8.5 and SAM Boards 1.6.11 was installed, and the "Arduino Due (Programming Port)" option was selected. Also, I had recently SUCCESSFULLY performed a clean OS install on each of the three computers, so I doubt that software on all three computers is defective. All other applications work fine on those computers.

  1. Mac laptop running OSX 10.13.

  2. Mac desktop running OSX 10.10.5.

  3. Second Mac laptop running OSX 10.10.5.

  4. Windows 10 virtual machine on the Mac laptop running OSX 10.13, and using VMWare 8.5 for the virtual machine.

Since the problem happens in all four approaches, is this a problem with the actual, physical Due board? Will Arduino send me a replacement Due?
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