I am using the turtlebot with 12.04 Precise and Ros Fuerte. I have gotten most of the other tutorials working, but the interactive marker teleoperation demo is not working. I receive no error message, but when rviz opens only the turtlebot appears, no interactive markers. Nothing changes when I click on Interact, no markers appear. I have gotten keyboard teleoperation working, but not interactive markers. Has anyone else had this problem and know how to fix it? Thanks!