Symptoms
Assume that you have a server that is running a Windows Server 2012 R2 Core installation. The logon UI crashes, and a black logon screen occurs for several seconds in one of the following scenarios:
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You connect to the server by using Remote Desktop Protocol (RDP) from a client that has a different screen resolution.
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You plug in another monitor to the server when the LogonUI.exe process is running.
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You rotate the screen orientation for the server device.
Resolution
To resolve this issue, install update rollup 2962409. For more information about how to obtain this update rollup package, click the following article number to view the article in the Microsoft Knowledge Base:
2962409 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 update rollup: June 2014
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More Information
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
