How long is your USB extension cable, please? RealSense cameras do not do well with extension cables due to the large amount of data that they transmit. The maximum length that others have had most success with is 1 m. It was found that with 2 m cables, the camera would not function except in cases where a premium high-grade 2 m extension cable was used.
Ok, so you are using Ctrl-C to shut down the nodelet manager of ROS. There is nothing wrong with shutting ROS processes down this way as far as I know, and as you said, it works fine for you except when using the Orbitty Carrier Board. I'm not a ROS expert, but I wonder if Ctrl-C also shuts down the Orbitty board.
There was a case where someone could not relaunch an Arduino board with ROS after doing Ctrl-C.
In that case, the connection problems were fixed by using the master branch.