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I just ran the demo and it took a couple seconds for turtle2 to start following turtle1 but it did follow eventually. Can you run tf_monitor to see if the turtle1 and turtle2 frames are being published by their broadcasters.
mwise@bws:~/maintained_stacks$ rosrun tf tf_monitor
RESULTS: for all Frames
Frames:
Frame: turtle1 published by /turtle1_tf_broadcaster Average Delay: 0.000284624 Max Delay: 0.000325169
Frame: turtle2 published by /turtle2_tf_broadcaster Average Delay: 0.000212012 Max Delay: 0.000221337
All Broadcasters:
Node: /turtle1_tf_broadcaster 325.392 Hz, Average Delay: 0.000284624 Max Delay: 0.000325169
Node: /turtle2_tf_broadcaster 328.424 Hz, Average Delay: 0.000212012 Max Delay: 0.000221337
RESULTS: for all Frames
Frames:
Frame: turtle1 published by /turtle1_tf_broadcaster Average Delay: 0.000256403 Max Delay: 0.000325169
Frame: turtle2 published by /turtle2_tf_broadcaster Average Delay: 0.000237316 Max Delay: 0.000270265
All Broadcasters:
Node: /turtle1_tf_broadcaster 69.198 Hz, Average Delay: 0.000256403 Max Delay: 0.000325169
Node: /turtle2_tf_broadcaster 69.1953 Hz, Average Delay: 0.000237316 Max Delay: 0.000270265
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