I am experiencing the duplicate COM port described above. It happens every time I try to run my sketch, which makes the whole setup virtually unusable. I am new to Arduino, so I don't know how long I should expect to wait for this bug to get fixed. Can anyone tells me what to expect?
Not surprisingly, the Serial.available() test fails in this case, so I can't execute a Serial.read() to get input.
Also, can someone tell me more about the suggestion to use Arduino IDE/Zero USB. What do I need to try? Very frustrated by being dead in the water.