After I close the Arduino IDE and unplug the teensy board, the teensy.exe process remains active and continuously attempts to create a file, always getting a "Path not found" result.

In this particular instance teensy.exe is attempting to create the hex file corresponding to the last sketch I was working on before shutting down the IDE:

C:\Users\cff\AppData\Local\Temp\build1a815bdf9c5bf de50d8033dce09cdb00.tmp\WhisperSom_01g.ino.hex

Is this behavior by design?

I've attached a ProcMon screen shot.

Click image for larger version. 

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-- CraigF