Sorry, I meant to say that the 'Hello World' output IS NOT being rendered.
I would also like to add that there are no error messages in the console. So, I don't know if the call to the EJB is not working, or if it is working but the markup is just not being rendered.
Do you see, in the console, the session bean deployed as SEAM component ? Do you see its JNDI mapping too ?
Does the Web contain a components.xml with the right JNDI binding ?