.
Enable debug from D3D control panel. It should provide you some insight about the problem.
You don't do it from the control panel in D3D11*, you do it by passing D3D11_CREATE_DEVICE_DEBUG when creating the device.
*Technically you can still do it by forcing the debug layer to be enabled for a given process, but it's way easier and more robust to just do it with code. Plus you probably only want it on for debug builds.