Consider the following scenario. You create a scheduled task on a Windows 8 or Windows Server 2012-based computer. Then, you set the trigger for the task to On workstation lock or On workstation unlock for a specific user account. In this scenario, the task does not start when you unlock or lock the computer by using the user account.
To resolve this issue, install the Windows RT, Windows 8, and Windows Server 2012 update rollup 2845533. For more information about how to obtain this update rollup package, click the following article number to go to the article in the Microsoft Knowledge Base:
2845533 Windows RT, Windows 8, and Windows Server 2012 update rollup: June 2013
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates