hi maciej
I'm also having the same problem with jbpm console. I replaced the jbpm-human-task-core for the version 5.4 and is the same.
I downloaded jbpm 5.3 install using the ant script an run the demo also with the ant script. please review this i don't think that is a particular problem frome some people. If you may test with the version avalaible to donwload in sourceforge. Here is the jboss log is the same that you saw in previos post from others
16:22:34,504 ERROR [stderr] (Thread-19) java.lang.IllegalArgumentException: org.hibernate.QueryParameterException: could not locate named parameter [userId]
16:22:34,504 ERROR [stderr] (Thread-19) at org.hibernate.ejb.QueryImpl.setParameter(QueryImpl.java:206)
16:22:34,504 ERROR [stderr] (Thread-19) at org.jbpm.task.service.TaskServiceSession.getTasksAssignedAsPotentialOwnerByStatusByGroup(TaskServiceSession.java:1011)
16:22:34,504 ERROR [stderr] (Thread-19) at org.jbpm.task.service.TaskServerHandler.messageReceived(TaskServerHandler.java:356)
16:22:34,504 ERROR [stderr] (Thread-19) at org.jbpm.task.service.hornetq.HornetQTaskServerHandler.messageReceived(HornetQTaskServerHandler.java:44)
16:22:34,504 ERROR [stderr] (Thread-19) at org.jbpm.task.service.hornetq.BaseHornetQTaskServer.run(BaseHornetQTaskServer.java:85)
16:22:34,504 ERROR [stderr] (Thread-19) at java.lang.Thread.run(Thread.java:619)
16:22:34,504 ERROR [stderr] (Thread-19) Caused by: org.hibernate.QueryParameterException: could not locate named parameter [userId]
16:22:34,520 ERROR [stderr] (Thread-19) at org.hibernate.engine.query.ParameterMetadata.getNamedParameterDescriptor(ParameterMetadata.java:99)
16:22:34,520 ERROR [stderr] (Thread-19) at org.hibernate.engine.query.ParameterMetadata.getNamedParameterExpectedType(ParameterMetadata.java:105)
16:22:34,520 ERROR [stderr] (Thread-19) at org.hibernate.impl.AbstractQueryImpl.determineType(AbstractQueryImpl.java:437)
16:22:34,520 ERROR [stderr] (Thread-19) at org.hibernate.impl.AbstractQueryImpl.setParameter(AbstractQueryImpl.java:407)
16:22:34,520 ERROR [stderr] (Thread-19) at org.hibernate.ejb.QueryImpl.setParameter(QueryImpl.java:201)
16:22:34,520 ERROR [stderr] (Thread-19) ... 5 more
16:22:42,460 ERROR [stderr] (http-localhost-127.0.0.1-8080-4) java.lang.RuntimeException: Timeout : unable to retrieve results
16:22:42,460 ERROR [stderr] (http-localhost-127.0.0.1-8080-4) at org.jbpm.task.service.responsehandlers.BlockingTaskSummaryResponseHandler.getResults(BlockingTaskSummaryResponseHandler.java:41)
16:22:42,460 ERROR [stderr] (http-localhost-127.0.0.1-8080-4) at org.jbpm.task.service.SyncTaskServiceWrapper.getTasksOwned(SyncTaskServiceWrapper.java:512)
16:22:42,460 ERROR [stderr] (http-localhost-127.0.0.1-8080-4) at org.jbpm.integration.console.TaskManagement.getAssignedTasks(TaskManagement.java:140)
16:22:42,460 ERROR [stderr] (http-localhost-127.0.0.1-8080-4) at org.jboss.bpm.console.server.TaskListFacade.getTasksForIdRef(TaskListFacade.java:101)