Friend, I would suggest two checks, maybe not that, but I'm trying to help in some way:
1) vbs in module options you selected:
required security module = System Access
Current Local Security = Allow access to the system
2) If your application is a server I suggest you do a test leaving a connected session (prey). It happened to me several times while I was logged into the server with a user admin the schedule worked, but when you log off did not work!