An update is available for Windows 8.1 Preview. This update resolves an issue that could result in instability during video playback in Windows Store apps.
This update is available from Windows Update.
An update (2863231) that resolves the same issue is offered when you upgrade to Windows 8.1 Preview.
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