I am using Teensy 3.1 and Teensyduino 1.18 on Windows XP SP3. The system generally works as expected.
However, if I press the "reload" button on the Teensy, or short the bottom-side "Reset" node to ground, while the Arduino Serial Monitor window is open, then Windows looses track of the Teensy (Serial port 'COM53' not found) and will not find it again until I either (A) reprogram the teensy using the "Upload" button in the Arduino window, or (B) unplug and reconnect the USB cable.
I'm not sure if this is a known bug or not. I believe this behavior has been the same on my system since the very first version of Teensyduino that worked with Teensy 3.0. It may in fact be simply due to how Windows XP handles USB-serial devices that disappear and reappear, without physically being unplugged and re-plugged.
However, if I press the "reload" button on the Teensy, or short the bottom-side "Reset" node to ground, while the Arduino Serial Monitor window is open, then Windows looses track of the Teensy (Serial port 'COM53' not found) and will not find it again until I either (A) reprogram the teensy using the "Upload" button in the Arduino window, or (B) unplug and reconnect the USB cable.
I'm not sure if this is a known bug or not. I believe this behavior has been the same on my system since the very first version of Teensyduino that worked with Teensy 3.0. It may in fact be simply due to how Windows XP handles USB-serial devices that disappear and reappear, without physically being unplugged and re-plugged.