Microsoft has released the following KB article:
Default logging variables unexpectedly used during task sequence in System Center 2012 R2 Configuration Manager
Consider the following scenario:
•You set logging variables in the registry on a client that’s running the Microsoft System Center 2012 R2 Configuration Manager client. For example, you set the logging variables as follows:
•You run a task sequence from a full Windows operating system to prepare for the installation in a Windows PE environment.
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