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possible cause of some serial issues on OSX

See original GitHub issue

reloading settings Packages/User/deviot.sublime-settings
reloading settings Packages/User/deviot.sublime-settings
reloading settings Packages/User/deviot.sublime-settings
Exception in thread Thread-1468:
Traceback (most recent call last):
  File "/Users/.../Library/Application Support/Sublime Text 3/Packages/Deviot (Arduino IDE)/libraries/pyserial/serialposix.py", line 501, in read
    'device reports readiness to read but returned no data '
Deviot (Arduino IDE).libraries.pyserial.serialutil.SerialException: device reports readiness to read but returned no data (device disconnected or multiple access on port?)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "./python3.3/threading.py", line 901, in _bootstrap_inner
  File "./python3.3/threading.py", line 858, in run
  File "/Users/.../Library/Application Support/Sublime Text 3/Packages/Deviot (Arduino IDE)/libraries/serial.py", line 138, in receive
    inp_text = self.serial.read(buf_number)
  File "/Users/.../Library/Application Support/Sublime Text 3/Packages/Deviot (Arduino IDE)/libraries/pyserial/serialposix.py", line 509, in read
    raise SerialException('read failed: {}'.format(e))
Deviot (Arduino IDE).libraries.pyserial.serialutil.SerialException: read failed: device reports readiness to read but returned no data (device disconnected or multiple access on port?)

On osx, sometimes starting serial doesn’t work, it gets stuck I have to toggle 3 times, then it creates a new group also. I logged this today.