[rules-users] Strange intermittent problem with Drools Flow

Hi, I'm seeing some odd behavior in some of my test cases. And it only seems to happen to one guy. And he's done fresh checkouts of the code, blown away his local M2 repository and verified installed software like OS and Java is same as everyone else's. I have some test cases that build up some simple flows programatically using fluent API. Very simple (start --> work item --> work item --> state --> end). I am using Drools Flow 5.1.1 with JPA (in-memory H2 DB for unit tests). Intermittently, after completing a work item, the flow doesn't continue. Logging in a process event listener shows that the the work item node is never left, although I can see in the logs that the work item is deleted from DB. There are no errors, warning or info level messages coming out of Drools or Hibernate prior to the failure. It only happens to one guy, but he can reproduce the problem regularly, although it moves around in different test cases and different points in the flows. Anyone ever seen this behavior before? Any possible explanations? I'd attach the log file, but it is huge since I've got hibernate logging set very verbose. Regards, Dan Nathanson