I update my game in Windows Store and when my project fails certification i try to build empty project in Unity 4.3.3 and check it with app certification kit. It have 3 errors. About one of them i read in unity 4.3.3 release notes: Windows Store Apps / Windows 8.1: IDXGIDevice3::Trim will be called on application suspend event, WACK requirement. Error occured because Trim is not called. Can anybode plz check this out. Try to pass certification on empty Unity 4.3.3 project. I build XAML C# solution on 8.1 SDK. Maybe it's a bug?