Starting gazebo fails

[ErikBerglund]

Using sr-ros-interface revision nr. 235, compiled from source, running under electric.

Starting roslaunch gazebo_worlds empty_world.launch works fine.

Starting roslaunch sr_hand gazebo_arm_and_hand_motor.launch results in a crash immediately after the gazebo window opens.
This is the last output before the crash:
ScopedName[gplane]
ScopedName[point_white]
Gazebo successfully initialized
[ INFO] [1316605693.104688273]: waitForService: Service [/gazebo/set_physics_properties] has not been advertised, waiting...
waiting for service spawn_urdf_model
gazebo: /usr/include/boost/smart_ptr/shared_ptr.hpp:418: T* boost::shared_ptr< <template-parameter-1-1> >::operator->() const [with T = urdf::Inertial]: Assertion `px != 0' failed.
Service call failed: transport error completing service call: unable to receive data from sender, check sender's logs for details
[gazebo-1] process has died [pid 28645, exit code -6].
log files: /home/ebd/.ros/log/79f7c84e-e447-11e0-8f54-0025b311be58/gazebo-1*.log

Full logs attached.