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When you see nodes starting and dying immediately it usually means that there is another instance of the node already running. do a ps aux |grep ros and look for the process running in the background.

Sometimes the openni_nodes don't go down cleanly just do a kill -9 on those processes.

Also given the above output it looks like you might not have your ROS_IP set in your environments. To check you can always open a terminal and type

env|grep ROS

this shows the values for all the ROS environment variables. If you ROS_IP is not set or set properly on one or more of the computers this should help you find the problem. Also you could review the networking tutorial here: http://ros.org/wiki/Robots/TurtleBot/Network%20Setup