I have established a number of folder pairs between a local disk and a NAS drive and can successfully run a synchronisation manually - both from within SyncToy (ST) and from a DOS window.  However, if I schedule ST using the W7 task scheduler the task is scheduled properly but fails to run. The scheduled task runs under my User ID - the same one I use to run ST manually.  The NAS drive is also used successfully by ST 2.0 on a Win XP 32bit machine connected to the same network

I see the following in the History tab in Task Scheduler:

Information    17-Jun-2010 4:12:00 PM    102    Task completed                                            (2)    0882488a-bf11-4f79-9a3a-aaf2ae7768d2
Information    17-Jun-2010 4:12:00 PM    201    Action completed                                          (2)    0882488a-bf11-4f79-9a3a-aaf2ae7768d2
Information    17-Jun-2010 4:12:00 PM    129    Created Task Process                                   Info   
Information    17-Jun-2010 4:12:00 PM    200    Action started                                               (1)    0882488a-bf11-4f79-9a3a-aaf2ae7768d2
Information    17-Jun-2010 4:12:00 PM    100    Task Started                                                (1)     0882488a-bf11-4f79-9a3a-aaf2ae7768d2
Information    17-Jun-2010 4:12:00 PM    319    Task Engine received message to start task    (1)   
Information    17-Jun-2010 4:12:00 PM    107    Task triggered on scheduler                          Info    0882488a-bf11-4f79-9a3a-aaf2ae7768d2

The following is from the ST log:

SYNC: 06/17/2010 16:12:00:480: Starting SyncToyCmd, version 2.1.0.0, built 19-Oct-2009 2:58:16 AM.
SYNC: 06/17/2010 16:12:00:612: *** Failed to execute folder pair Primary photographic area. Could not locate folder M:\Photography\Primary Area\.
SYNC: 06/17/2010 16:12:00:612: *** Failed to execute folder pair Miscellaneous. Could not locate folder M:\Photography\Miscellaneous\.
SYNC: 06/17/2010 16:12:00:612: *** Failed to execute folder pair Work Areas. Could not locate folder M:\Photography\Work Areas\.
SYNC: 06/17/2010 16:12:00:612: *** Failed to execute folder pair Communal Work Area. Could not locate folder M:\Communal Work Area\.

I would love some help on this one :-).  Other people seem to have ST 2.1 running properly on W7 so I presume I am doing something dumb but what?

Additional piece of information I forgot to include: the "M" drive is the target drive, i.e the NAS drive