Some Scheduled Tasks may fail to run. This may happen after upgrading Active Roles.
For example, the Deletion of Deprovisioned Objects scheduled task may not have an Active Roles service selected for Execute on on the General tab of the Properties. The attached screen capture called Execute on Scheduled Task.jpg shows how the Execute on field will be blank.
Review all of the Scheduled Tasks to ensure an Active Roles service is selected for Execute on.
Select the drop down to the right of the Execute on to select an Active Roles service to use.