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 applied when you upgrade to Windows 8.1 Preview.
An update (2863221) that resolves the same issue is available from Windows Update.
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