Symptoms
Consider the following scenario:
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You run an application that creates a topmost window by using the WS_EX_TOPMOST extended window style on a computer that is running Windows 8.1 or Windows Server 2012 R2.
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The application calls the SetWindowPos function together with an hwndInsertAfter parameter whose value is set to HWND_NOTOPMOST in order to remove the WS_EX_TOPMOST extended window style from the window.
In this scenario, the window that no longer has the WS_EX_TOPMOST extended window style may be displayed incorrectly above other windows that have the WS_EX_TOPMOST extended window style.
Resolution
Update information
The fix for this problem is included in security update 3002885. This update is dated November 11, 2014.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about the terminology that Microsoft uses to describe software updates.
