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Problems flashing hex file to nRF51

I just got a nRF51 and am having trouble getting started with it. I created a very simple program using the mbed compiler and produced a hex file which I now wish to flash to the nRF51. I fire up nRFGo Studio, select nRF51 Bootloader in the Device Manager window, select my hex file, select the COM port which is labelled Segger and hit Program. I get messages in the Log as follows:

Progress 0 Transmission timeout Ack out of sequence or not ack returned.

Or at least that's what I used to get. Now I'm not seeing the COM port for Segger.

Could you help me get started please?

Thank you