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SES RTT output not visible

I am new to the Nordic SDK and Segger embedded studio, and I am trying to test my NRF52840 dev board.

I am running the "ble_app_blinky_pca10056_s140" example, and I want to view the RTT output in the Debug window of SES.

I have gone into SDK_config.h ,enabled RTT and disabled UART logging.

When I start debugging the program, the Debug window cursor actually moves down some lines every time I press the dev kit button, so it is receiving something, it just isnt visible at all.

Also, if I use the J-Link RTT viewer program instead of SES, the messages appear as they should. 

Cursor at the start before pressing any button on the dev board.SES Debug cursor at start

Cursor has moved down showing some data received, but nothing shown

SES Debug cursor after button presses

RTT viewer shows the correct output:

RTT viewer shows the messages

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