Problem setting up scheduled task

I'm on Vista Ultimate. I'm trying to set up a scheduled task which will copy
a file from within my AppData folder (I'm an Admin, running with UAC on) to
another local user's AppData folder (they're a normal User).

My basic Action in the task is:

Program:
robocopy
Arguments:
"C:\Users\Mike\AppData\Local\Microsoft\Media Player"
"C:\Users\Hesper\AppData\Local\Microsoft\Media Player"
CurrentDatabase_360.wmdb /SEC

I've ticked the "Run with highest privileges" box on the General tab, since
I think that is necessary to copy stuff into another users folder?

I've set this to Trigger on login to my account, but a Condition is that
there should be idle time for 1 minute.

OK. So, when I select this scheduled task and manually hit the Run button
in the scheduler window, it works fine: a cmd window pops up and I see
robocopy's progress in copying the file to completion.

BUT... when I leave this task to self-trigger, things do NOT work out so
well. The file is NOT copied. Nothing ever seems to happen.

In the top panel, under the "Last Run Result" column, it says (0x41325).

So, what gives? Why does this work when I run the task manually, but not
when it self-triggers?

Thanks for any help.

Mike