Silverlight 5 - 3D - RenderModeReason - TemporarilyUnavailable

I'm trying to create a simple Silverlight 3d application...

I have a good enough PC, but when I run the Silverlight application I get this:

RenderModeReason - TemporarilyUnavailable... WTF is that? o_O

PS: The sample 3D appli开发者_如何学Ccations where made by MS and are compiling and working.

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In order to be able to use 3D acceleration in your app (and all the XNA namespaces), you must enable HardwareAcceleration during plugin initialization. Fortunately, it's easy:

<object data="data:application/x-silverlight-2," type="application/x-silverlight-2" width="100%" height="100%">
      [...]
      <param name="enableGPUAcceleration" value="true" />
      [...]
</object>

To enable GPU acceleration for Out of browser apps, set the enable GPU acceleration option on the project property page.