I am facing same issue as you do. Have you found some solution?
I have several different ears and just one of them is not visible in admin console. I made some investigation and found that problematic ear contains sar module and jboss-app.xml in ear/META-INF which points to this sar. When I remove jboss-app.xml from ear, I can see ear in console, but sar is not working.
Is here someone who has some idea what is going wrong?
I am using JBoss 6.1.0.