CQRLOG's K3NG CW interface does not work unless I have opened Minicom or Arduino Serial Port Monitor first. Then it works just fine. In order to use the K3NG CW interface I have to leave Minicom running on the same port (in my case /dev/ttyUSB1) at the same time. If I close Minicom CQRLOG's K3NG CW interface stops responding. Is this a bug?
Since posting this I saw the same bug report in 2014 by Jim, W2XO. It seems CQRLOG does not set the port speed when the K3NG CW interface starts. A workaround is to use the terminal command: stty -F /dev/ttyUSB1 115200, but this command has to be executed after every reboot.