maybe its the order of the argument:
-mp "C:/jboss-as-7.1.0.CR1b/modules" -logmodule org.jboss.logmanager -jaxpmodule javax.xml.jaxp-provider org.jboss.as.standalone --server-config=standalone.xml
my server starts fasts and correct but after a while it 'encountered a problem' (Server JBoss 7.1 Runtime Server failed to start. )