1. Type in secpol.msc /s
  2. Select "Local Policies" in MSC snap in
  3. Select "User Rights Assignment"
  4. Right click on "Log on as batch job" and select Properties
  5. Click "Add User or Group", and include the relevant user.

 

I'm posting this as some idiot at a stupid company (you know who you are!!) changed a Global Group policy and it broke the permissions for the Service Account used to run Task Manager Jobs.

Good Luck!