Well go figure ... figured it out ... read another posting and someone mentioned the following: "I've updated my drivers but still not working. I have a kindle paperwhite but its not connected to the PC. Thanks for the suggestions though."
I took a look and noticed that I had plugged in my old Dell Windows Phone to charge the battery into the same cable I use to update my Sony PRS-T1 reader.
Unplugged the phone and restarted Calibre ... all good!!
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