Can no longer connect to move_base server

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Hello,

Apologies for this rather vague question, but has something changed with move_base over the past month in the ROS Electric debian version? I have a simple Python script that worked perfectly a month ago and now it hangs on move_base.wait_for_server(). I am running the move_base server and client script on the same machine and I have tried it on two different machines (both running Ubuntu 10.04) with the same problem. My script can be found at: http://code.google.com/p/pi-robot-ros-pkg/source/browse/trunk/experimental/pi_robot/pi_navigation/nodes/nav_test.py.

When running 'rostopic list /move_base' in the terminal where I am running my client script, I see the following nodes:

/move_base/NavfnROS/NavfnROS_costmap/inflated_obstacles
/move_base/NavfnROS/NavfnROS_costmap/obstacles
/move_base/NavfnROS/NavfnROS_costmap/robot_footprint
/move_base/NavfnROS/NavfnROS_costmap/unknown_space
/move_base/NavfnROS/plan
/move_base/TrajectoryPlannerROS/cost_cloud
/move_base/TrajectoryPlannerROS/global_plan
/move_base/TrajectoryPlannerROS/local_plan
/move_base/TrajectoryPlannerROS/parameter_descriptions
/move_base/TrajectoryPlannerROS/parameter_updates
/move_base/current_goal
/move_base/global_costmap/inflated_obstacles
/move_base/global_costmap/obstacles
/move_base/global_costmap/parameter_descriptions
/move_base/global_costmap/parameter_updates
/move_base/global_costmap/robot_footprint
/move_base/global_costmap/unknown_space
/move_base/goal
/move_base/local_costmap/inflated_obstacles
/move_base/local_costmap/obstacles
/move_base/local_costmap/parameter_descriptions
/move_base/local_costmap/parameter_updates
/move_base/local_costmap/robot_footprint
/move_base/local_costmap/unknown_space

Any thoughts how I can debug this?

Thanks!
patrick