Is anyone using TDP 6.3 to run VSS backup against Exchange 2010 DAG?

We're fighting a problem where a scheduled backup is reported as "successful" 
from the TSM server perspective, but according to the TDP/Exchange manager the 
backup never runs.  He doesn't see any corresponding backup history in the TDP 
GUI.

Setting the TDP Scheduler service to Log On As a domain account (not "Local 
System") seems to let scheduled backup work, but the TDP/Exchange manager wants 
to avoid password change polices by using Local System as he has for years with 
Exchange 2007.

We've got a PMR open, with no progress other than "try a domain account".

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Harold Vandeventer