To rule out the obvious - are you sure the application server isn't started in debug mode and perhaps some debug breakpoint has been hit?
It does behave like that, but this is a fresh download from late yesterday, I haven't had the chance to do any debugging yet.
501 2681 2634 0 9:26am ttys000 0:14.75 /Library/Java/JavaVirtualMachines/jdk1.7.0_06.jdk/Contents/Home/bin/java -D[Standalone] -server -XX:+UseCompressedOops -Xms64m -Xmx512m -XX:MaxPermSize=256m -Djava.net.preferIPv4Stack=true -Djboss.modules.system.pkgs=org.jboss.byteman -Djava.awt.headless=true -Dorg.jboss.boot.log.file=/opt/wildfly/standalone/log/server.log -Dlogging.configuration=file:/opt/wildfly/standalone/configuration/logging.properties -jar /opt/wildfly/jboss-modules.jar -mp /opt/wildfly/modules org.jboss.as.standalone -Djboss.home.dir=/opt/wildfly -Djboss.server.base.dir=/opt/wildfly/standalone
Problem might be your JDK, given that mac jdk 1.7u6 has lots of known issues in NIO impl.
Can you try with jdk7 u40 and let us know if problem remains.
Didn't realise I'd fallen quite that far behind, good spot, that did it, thanks!