There is a rather big conceptual FLUSH change in JGroups 2.6. In 2.6 we always allow unicasts messages to pass down through FLUSH.down() latch. Bela and I realized that virtual synchrony property is relevant only to multicast messages and that FLUSH should not be concerned with unicasts at all. This has potentially a big impact on JBCACHE-315. Lets reopen discussion. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4097898#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...