Trying to get Human Tasks to work in a BPEL process

I have a workflow that needs to include a human review point for quality control purposes.
I have added a "Human Task" at that point, and that seems to partially work. I can see the tasks in BPM and I can Approve them. What's not working is that after the approval, the next step in the BPEL flow isn't getting applied.
Perhaps related is that I can see the human task was executed from within the SOA Console. However, I don't see the BPEL instance that it was associated with. I only seem to be able to see instances that have completed.
So, I'd appreciate any help you can provide on what I might be doing wrong or how to best diagnose what's going on.

Ok, I ran my data through again, trying to pay attention to what's going on in the console log and in the oc4j/diagnostic log. I do see various stack traces and diagnostics - none of which are directly in my code. However, I see lots of diagnostic stuff coming out often - even when I'm not doing anything, so it's hard for me to say for sure they're related.
I run OC4J out of JDeveloper using "Debug Server Instance". I have deployed my web service and BPEL stuff to the OC4J.
Here's the stuff I see that my help diagnose what's going on.
At about the timeframe where the human task is being executed within the BPEL flow:
In the "Debugging: DefaultServer - Log" tab in Jdeveloper I see:
Aug 15, 2008 11:11:17 AM com.collaxa.cube.CubeLogger error
SEVERE: <DispatchHelper::handleMessage> failed to handle message
javax.ejb.EJBException: An exception occurred during transaction completion: ; nested exception is: javax.transaction.RollbackException: Timed out
javax.transaction.RollbackException: Timed out
     at oracle.oc4j.transaction.TransactionImpl.checkForRollbackOnlyWhileInCommit(TransactionImpl.java:714)
     at oracle.oc4j.transaction.TransactionImpl.doCommit(TransactionImpl.java:341) ...
This is followed by some lines of the form:
Aug 15, 2008 11:11:17 AM com.collaxa.cube.CubeLogger error
SEVERE: <BaseScheduledWorker::process> Failed to handle dispatch message ... exception ORABPEL-05002
Message handle error.
An exception occurred while attempting to process the message "com.collaxa.cube.engine.dispatch.message.invoke.InvokeInstanceMessage"; the exception is: An exception occurred during transaction completion: ; nested exception is: javax.transaction.RollbackException: Timed out
This error is a wrapper for an exception thrown by the message handler.
Please check the exception trace in the log (with loggers set to debug mode).
ORABPEL-05002
Message handle error.
An exception occurred while attempting to process the message "com.collaxa.cube.engine.dispatch.message.invoke.InvokeInstanceMessage"; the exception is: An exception occurred during transaction completion: ; nested exception is: javax.transaction.RollbackException: Timed out
This error is a wrapper for an exception thrown by the message handler.
Please check the exception trace in the log (with loggers set to debug mode).
     at com.collaxa.cube.engine.dispatch.DispatchHelper.handleMessage(DispatchHelper.java:176)
     at com.collaxa.cube.engine.dispatch.BaseScheduledWorker.process(BaseScheduledWorker.java:82) ...
At around the time I approved the task in the BPM console, I see
Aug 15, 2008 11:13:11 AM oracle.j2ee.util.AnnotatedLogger logWithThrowable
WARNING: J2EE JNDI-00009
Aug 15, 2008 11:13:50 AM oracle.adfinternal.view.faces.renderkit.rich.SimpleSelectOneRenderer _getSelectedIndex
WARNING: Could not find selected item matching value "" in RichSelectOneChoice[UIXEditableFacesBeanImpl, id=navList1]
Aug 15, 2008 11:13:50 AM oracle.adfinternal.view.faces.renderkit.rich.SimpleSelectOneRenderer _getSelectedIndex
WARNING: Could not find selected item matching value "" in RichSelectOneChoice[UIXEditableFacesBeanImpl, id=navList1]
Aug 15, 2008 11:13:53 AM oracle.jbo.uicli.mom.JUApplicationDefImpl logCpxUsageIdCollision
SEVERE: Both validatefeedtaskflow.DataBindings.cpx and validatefeedtaskflow.DataBindings.cpx use the same usageId: validatefeedtaskflow_taskDetails1PageDef
FIX: Use validatefeedtaskflow_validatefeedtaskflow_taskDetails1PageDef as the usageId in validatefeedtaskflow.DataBindings.cpx
08/08/15 11:13:53 InvokeActionBean.reloadParentBrowser start
08/08/15 11:13:53 InvokeActionBean.reloadParentBrowser end
Aug 15, 2008 11:13:54 AM oracle.adfinternal.view.faces.renderkit.rich.SimpleSelectOneRenderer _getSelectedIndex
WARNING: Could not find selected item matching value "" in RichSelectOneChoice[UIXEditableFacesBeanImpl, id=navList1]
Aug 15, 2008 11:13:54 AM oracle.jbo.uicli.mom.JUApplicationDefImpl logCpxUsageIdCollision
SEVERE: Both validatefeedtaskflow.DataBindings.cpx and validatefeedtaskflow.DataBindings.cpx use the same usageId: validatefeedtaskflow_taskDetails1PageDef
FIX: Use validatefeedtaskflow_validatefeedtaskflow_taskDetails1PageDef as the usageId in validatefeedtaskflow.DataBindings.cpx
Aug 15, 2008 11:13:55 AM oracle.adfinternal.view.faces.renderkit.rich.SimpleSelectOneRenderer _getSelectedIndex
WARNING: Could not find selected item matching value "" in RichSelectOneChoice[UIXEditableFacesBeanImpl, id=navList1]
Aug 15, 2008 11:13:55 AM com.evermind.server.http.HttpMessages commonIOExceptionThrown
WARNING: The application: ValidateFeedTaskFlow threw a Broken pipe IOException. Though this error may occur many times, this message is only logged once. To log additional occurances of this exception, set the log level of the com.evermind.server.http.EvermindHttpServletResponse trace logger to Level.FINE or finer.
java.io.IOException: Broken pipe
     at sun.nio.ch.FileDispatcher.write0(Native Method)
     at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:29) ...
In the OC4J/diagnostic.log around the time of the approval, I see a lot (and I mean a lot) of lines of the form:
[2008-08-15T11:13:55.332-06:00] [j2ee] [NOTIFICATION] [] [applications.ValidateFeedTaskFlow] [tid: 24] [ecid: 0000Hj7MyYX000000000000000030eCWL00000003y,0] [APP
: ValidateFeedTaskFlow] ValidateFeedTaskFlow: Broken pipe
After a bunch of the above (only varying in timestamp), I see
2008-08-15T11:13:55.814-06:00] [j2ee] [NOTIFICATION] [J2EE JSP-00052] [jsp] [tid: 18] [ecid: 0000Hj7MyxG000000000000000030eCWL000000048,0] [APP: worklist] [arg: /templates/panelPageTemplate.jspx] Using the ProviderURI /templates/panelPageTemplate.jspx that is returned from custom provider for processing requests.
[2008-08-15T11:13:55.815-06:00] [j2ee] [WARNING] [J2EE HTTP-00022] [http] [tid:24] [ecid: 0000Hj7MyYX000000000000000030eCWL00000003y,0] [APP: ValidateFeedTaskFlow] [arg: ValidateFeedTaskFlow] [arg: Broken pipe] The application: ValidateFeedTaskFlow threw a Broken pipe IOException. Though this error may occur many times, this message is only logged once. To log additional occurances of this exception, set the log level of the com.evermind.server.http.EvermindHttpServletResponse trace logger to Level.FINE or finer.[[
java.io.IOException: Broken pipe
at sun.nio.ch.FileDispatcher.write0(Native Method)
at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:29)
I'm happy to run things again or dig for specific information that might help in diagnosing the problem. I can also send the complete files if that helps.
Thanks in advance.

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Trying to get Human Tasks to work in a BPEL process

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