odometry messages to C++ node silently dropped

edit

I'm sure this is something silly, but I'm stumped and would really appreciate some help.

I was writing a node that needs to consume odometry messages, and I just couldn't get it to actually consume the messages. (By that I mean that I can rostopic pub ... a message and a rostopic echo ... will show that it has been sent, but my subscriber callback method isn't called.) I have trimmed my code down to a small ROS package and posted it on GitHub ( https://github.com/sambishop/aav-ros-... ), but I will also post it below.

The problem seems to be related to nav_msgs/Odometry messages somehow. If I modify the code to consume std_msgs/String messages instead, then it works. Also, this code works on one of my computers, the one stuck on Hydro, but not on my computer running Indigo.

QuinticControl.h:

#include "nav_msgs/Odometry.h"
#include "ros/ros.h"

namespace aav_control {
  class QuinticControl {
  public:
    void updateOdometry(const nav_msgs::Odometry::ConstPtr &odometry);
  };
}

QuinticControl.cpp:

#include "QuinticControl.h"

using namespace aav_control;

void QuinticControl::updateOdometry(const nav_msgs::Odometry::ConstPtr &odometry) {
  fprintf(stderr, "updateOdometry() called\n");
}

main.cpp:

#include "QuinticControl.h"
#include "ros/ros.h"

int main(int argc, char **argv) {
  ros::init(argc, argv, "aav_control2");
  ros::NodeHandle node;
  aav_control::QuinticControl control;
  ros::Subscriber subscriber = node.subscribe(
      "odometry/filtered",
      1000,
      &aav_control::QuinticControl::updateOdometry,
      &control
    );
  ros::spin();
  return 0;
}

This is my rostopic command:

rostopic pub /odometry/filtered nav_msgs/Odometry -f src/aav_control2/odom_.1_.5.yaml

EDIT 1
This is the output of rosnode:

$ rosnode info /aav_control2 
--------------------------------------------------------------------------------
Node [/aav_control2]
Publications: 
 * /rosout [rosgraph_msgs/Log]

Subscriptions: 
 * /odometry/filtered [unknown type]

Services: 
 * /aav_control2/get_loggers
 * /aav_control2/set_logger_level


contacting node http://turbo:36683/ ...
Pid: 7592
Connections:
 * topic: /rosout
    * to: /rosout
    * direction: outbound
    * transport: TCPROS

Here is the version using std_msgs::String that works:

QuinticControl.h:

#include "std_msgs/String.h"
#include "ros/ros.h"

namespace aav_control {
  class QuinticControl {
  public:
    void updateOdometry(const std_msgs::String::ConstPtr &odometry);
  };
}

QuinticControl.cpp:

#include "QuinticControl.h"

using namespace aav_control;

void QuinticControl::updateOdometry(const std_msgs::String::ConstPtr &odometry) {
  fprintf(stderr, "updateOdometry() called\n");
}

And the rostopic command:

rostopic pub /odometry/filtered std_msgs/String 'hello'

When that is run, the "updateOdometry() called" message is written to the console. You can see that I have only modified the callback method signature and the #include. Unless there's a problem with the way I'm using rostopic?

I have verified the works-with-strings/doesn't-work-with-odometry-messages on a second computer running Indigo. Unfortunately, I don't have easy access to a second computer running Hydro.