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That's a new one alright! That goes on to explain how to disable the service seeing this problem.
More -Users running the latest iteration of Windows might experience a Black Screen when they attempt to unlock their machine in certain conditions, Microsoft warned.
According to the Redmond company, the issue impacts not only Windows 7 customers, but also those leveraging Windows Vista.
The problem is not likely to affect end users, since the PCs affected need to feature special security configuration specific of computer running in enterprise environments.
First off, both Vista and Windows 7 computers need to be running the “Aero” graphics mode.
In addition, the machines also have to sport some extra security restrictions as well as added security software. Microsoft explained that these configurations are often used by enterprises, or are being mandated by DISA (Defense Information Systems Agency) or DoD (Department of Defense) requirements.
In the specific scenario described above, an user also needs to lock the computer and leave it untouched for as long as it will take for the power policy to force the screen to go black, at least 20 minutes in the Balanced configuration.
Windows 7 Black Screen on Unlock - Softpedia
That's a new one alright! That goes on to explain how to disable the service seeing this problem.