On http://www.theconstruct.ai/morpheus-chair-dynamixel-servos-with-robot-arm-ros-s4-ep-1/ we see that .bashrc sources 
.tc_bashrc that exports 
    export ROS_MASTER_URI=http://10.8.0.1:11311
    export ROS_IP=10.8.0.1

giving problems.    

Ask Miguel to unset that or on ROSDS we deliberately override user's .bashrc with ours after downloading it from S3.

Or could it be that the value is set when creating the ROSject on the .zip found on ROSDS?

export ROS_MASTER_URI=http://master:11311