Groovy Python node cannot find move_base_msgs module

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Hello,

My setup: Latest Groovy debs on Ubuntu 12.04LTS.

I have a simple Python node in a catkin package that needs to import MoveBaseAction and MoveBaseGoal from move_base_msgs. My import line looks like this:

from move_base_msgs.msg import MoveBaseAction, MoveBaseGoal

which worked fine in Fuerte. My package.xml file includes the line:

<run_depend>move_base_msgs</run_depend>

And my Groovy debian installation has the move_base_msgs package installed:

$ rospack find move_base_msgs
/opt/ros/groovy/stacks/navigation/move_base_msgs

But when I try to run the node I get the error:

Traceback (most recent call last):
  File "/home/patrick/Dropbox/Robotics/ros/catkin_ws/src/rbx2/rbx2_tasks/nodes/nav_tasks.py", line 35, in <module>
    from move_base_msgs.msg import MoveBaseAction, MoveBaseGoal
ImportError: No module named move_base_msgs.msg

Other message imports work fine; for example, I can import the Odometry message type from nav_msgs.msg using:

from nav_msgs.msg import Odometry

with the following line in my package.xml file:

  <run_depend>nav_msgs</run_depend>

What am I doing wrong?

Thanks!
patrick