Lee, I folowed the links and got this working for richfaces-web app from JBoss Central. I would try to start eclipse from command line and check if there are any error mesages or exceptions in standard error output.
I have only two differences from your project:
1. I have WEB-INF/wro.xml instead of WEB-INF/Wro4j.xml
2. I configured only jsDestinationFolder and cssDestinationFolder in configuration