What will happen if you run spreadsheet with user1 ,and again with user 1 ?Is the time similiar?
Verify you have registered both users with Cluster Manager on the Users page.
Also try :
Open cmd console.
run in the console : "runas /user:user1@your_domain cmd"
A new console will open under user1 permissions
run in the new consloe "job submit test" command to confirm that you cluster accepts user credentials (you shouldn't be prompted for password here)
Daniel Drypczewski