GetFrontBufferData failed: D3DERR_INVALIDCALL
History: UD3DRenderDevice::ReadPixels <- UViewport::Exec <- UWindowsViewport::Exec <- UInput::ExecInputCommands <- UInput::Process <- UEngine::InputEvent <- UWindowsViewport::CauseInputEvent <- WM_KEYUP <- UWindowsViewport::ViewportWndProc <- WWindow::StaticProc <- DispatchMessage <- 00191208 257 <- MessagePump <- MainLoop