I can't provide anything useful to go on with, in every run something different doesn't work. Sometimes a subprocess is not executed any more, sometimes variables are lost or an action handler's executionContext doesn't have a contextInstance (executionContext.getContextInstance() returns null). It's just something goes terribly wrong, and its hard to tell what. I don't have the time to dig further in this. I guess we will leave it to single threaded execution for now and look for some other product to use. Our project has to be finished soon... I might do some test case and open a jira issue... alex View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4052130#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...