Howard, Got it sorted finally, you will be glad to hear that I have traced this problem down to faulty hardware. After two months of IT telling me the hardware was good I decided to rule it out and ran my own test across some desktops. Works perfectly, no faults. You should be able to close the JIRA you created. Later, Ross View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4255048#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...