ould guess that another process has grabed the USB port if you crash OSX thjen it generally recovers with the last process states.Whats the result of using the terminal command ls /dev/tty.*This will identify what the USB ports are currently set up by..Without an Arduino connect you qwuill usually get/dev/tty.Bluetooth-Incoming-Port /dev/tty.Bluetooth-Modemalsols /dev/cu.*produces ../dev/cu.Bluetooth-Incoming-Port /dev/cu.Bluetooth-Modem
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