Recent new issue with gazebo 7 and ros:
When I use in my world a model I did with the model editor, it doesn't publish the links in the topic /gazebo/link_states . And it did before.
I used the model editor to compose a model with two different models I had and a fixed link between them. Then, when launching the world it doesn't publish their links in the topic.
I think that when in the sdf file the model is composed by more models inside, the topic is not displaying those links.