most probably the deployment scanner extension on this JBoss instance is not enabled. Have a look in the server configuration for
<extension module="org.jboss.as.deployment-scanner"/>
edit @Magnilex: You're right, the above is for JBoss 7.0. (step once again in the numbering trap between EAP and OS version)
For JBoss 6.1.0 (OS) the setting of the DeploymentScanner is in "hdscanner-jboss-beans.xml". So you chould check your configuration for a "setting in the namespace 'urn:jboss:bean-deployer'".
Could not point it in more detail as I have no JBoss 6.1.0 (OS) installed. I had only a quick view in the installation package. But I guess you should now be able to find the related setting.