When you open a Microsoft Silverlight app on a Windows 8.1-based device, you may encounter permission issues on some Silverlight features, such as the hardware acceleration feature.
To resolve this issue, install the most recent cumulative security update for Internet Explorer. To do this, go to Microsoft Update.
This update was first included in the following security update:
2909921 MS14-010: Cumulative security update for Internet Explorer: February 11, 2014
For technical information about the most recent cumulative security update for Internet Explorer, go to the following Microsoft website:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
See the terminology that Microsoft uses to describe software updates.