Problems when run WSA Windows 8.1 and PUN v1.72

On connect got error:
Connect() to 'ns.exitgames.com' failed: System.InvalidOperationException: A delegate was assigned when not allowed. (Исключение из HRESULT: 0x80000018)
at Windows.Foundation.IAsyncAction.put_Completed(AsyncActionCompletedHandler handler)
at System.WindowsRuntimeSystemExtensions.AsTask(IAsyncAction source, CancellationToken cancellationToken)
at ExitGames.Client.Photon.SocketTcpNetFxCore.Connect()

On other platforms works well