If I run zenchkrels -x1 -r -v10 -R /zport/dmd/JobManager , I get these extra 2 lines:
DEBUG:zen.PropertyManager:Property zCommandCycleTime is deprecated. It should be removed from the system.
DEBUG:zen.PropertyManager:Property zXmlRpcMonitorIgnore is deprecated. It should be removed from the system.
Might be relevant.