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hmm it seems like this is a problem of the local planner... This usually happens when the robot thinks it is too close to an obstacle.

Are you sure the local and global costmap show no obstacles close to the robot?

You can also try to use another local-planner. ROS offers the "base_local_planner" and "dwa_local_planner" (see http://www.ros.org/wiki/navigation/Tutorials/Navigation #4 for more information).

But my guess still is that there is something set up wrong with the localization and/or obstacles...