I have noticed while working with the reporting module that whenever i restarted or badly choked OpenMRS instance to death or tomcat through quiting un-expectedly, i ended up seemingly loosing my cohort queries as well as indicator definitions, i used to re-create new test ones until i got fed up only to check the logs and find out that the deserialiser fails to do its work basing on the logs below although the the serialized_objects still exist in the database; http://pastebin.com/SZaZDgJC in summary:
Caused by: com.thoughtworks.xstream.converters.ConversionException: org.openmrs.User_$$_jvst711_41 : org.openmrs.User_$$_jvst711_41
yet