hokuyo dies in ros-gazebo, works in gazebo?

I've just upgraded to ROS Jade and Gazebo 5.0 and am having problems with my robot model. When I take out my lidar node, my world works with both $ gazebo myworld.world and $roslaunch mylaunch.launch where mylaunch wraps myworld.world. But when I add my hoyoyo lidar (as used to work in Indigo), it works with $ gazebo myworld.world but segfaults when I run gazebo through roslaunch. Any ideas? Here's what I add to sdf for the lidar: model://hokuyo0.45 0 0.45 0 0.15 0hokuyo::linkchassis0 0 100