No response from Socket1 Pin6

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1 

        OutputPort _pin = new OutputPort((Cpu.Pin)FEZCerbuino.Pin.Gadgeteer.Socket1.Pin6, false);

        bool _val = true;
        while (true) {
            _pin.Write(_val);
            _val = !_val;
            Thread.Sleep(3000);
        }

So on my CerbBee I have an LED connected between pin 6 (PA13) and GND. The code toggles the pin every 3 seconds, but the LED never lights. Tests with the multi-meter show that that the pin voltage is 1.8V and never changes. When I do the same thing with pin4 (PB10) it works.

Does anyone have any ideas?

2

What do you mean? How does it being a debug output preclude it from being used as a GPIO?

3

@ andre.m - Well, you live and you learn; I switched to using a different pin.