System::ExecutionInstanceGUID &&<&&> Logging ExecutionId ????

Any help in understanding and working around this odd behavior is greatly appreciated!

I have the default SQL database logging enabled (to sysdtslog90).
I start my package with an ExecuteSQL task that writes most of the system variables to an execution log.
Included is the value of the System::ExecutionInstanceGUID variable (which I thought should match the standard SSIS logging executionid value).

I have an error handling ExecuteSQL task that updates my execution log with an end time and the task that failed.
This is right out of the ProjectREAL audit approach.

Problem with the Error ExecuteSQL update is that it is trying to match the SSIS log but cannot.
This is the SQL being used:
select top 1 @failureTask = source
from dbo.sysdtslog90
where executionid = @executionGuid
and (upper(event) = 'ONERROR')
and upper(source) <> @packageName
order by endtime desc

When I enable OnInformation event logging something interesting appears.
The ExecutionGUID changes during validation of my one Data Flow Task in the package YET the system variable does not get updated with the new value!!!!

Log Excerpt:
1 OnInformation DFT Load Customer Test B94FDA4C-46D9-4193-BD87-12CFCB31EA1A Validation phase is beginning.
2 OnInformation DFT Load Customer Test 282F7D2E-329A-49DB-90B6-838053114940 Validation phase is beginning.
3 PackageStart AuditSample 282F7D2E-329A-49DB-90B6-838053114940 Beginning of package execution.
4 OnPreExecute AuditSample 282F7D2E-329A-49DB-90B6-838053114940
5 OnPreExecute SCR Set Correct Execution GUID 282F7D2E-329A-49DB-90B6-838053114940
6 OnVariableValueChanged AuditSample 282F7D2E-329A-49DB-90B6-838053114940 ExecutionGUID
7 OnInformation SCR Set Correct Execution GUID 282F7D2E-329A-49DB-90B6-838053114940 System Variable - Package Name AuditSample Start Time 11/14/2007 8:56:26 PM ExecutionGuid b94fda4c-46d9-4193-bd87-12cfcb31ea1a


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