Версия 4.1.5, перестает отрабатывать NewSecurities

private void btnConnect_Click(object sender, EventArgs e)
        {
            
            if (trader == null || !trader.IsConnected)
            {
                if (trader == null)
                {
                    trader = new QuikTrader(edtPathToQuik.Text);
                    trader.Connected += trader_Connected;
                }

                if (!trader.IsConnected)
                    trader.Connect();
                
            }
            else
                trader.Disconnect();

             waitHandle.WaitOne();

            // запускаем экспорт по DDE
            trader.StartExport(new[] { trader.SecuritiesTable, trader.MyTradesTable, trader.DerivativePositionsTable, trader.DerivativePortfoliosTable, trader.OrdersTable, trader.TradesTable });
            waitHandle.WaitOne();
            trader.RegisterTrades(security);

           

        void trader_NewSecurities(IEnumerable<Security> securities)
        {
            if (security==null)
                security = securities.FirstOrDefault(sec => sec.Code == "RIZ2");
            waitHandle.Set();
        }

        void trader_NewPortfolios(IEnumerable<Portfolio> portfolios)
        {
            if (portfolio == null)
                portfolio = portfolios.FirstOrDefault(p => p.Name == "SPBFUT00Q51");
        }

        void trader_Connected()
        {
            
            trader.NewPortfolios += trader_NewPortfolios;
            trader.NewSecurities += trader_NewSecurities;
            trader.NewTrades += trader_NewTrades;

            waitHandle.Set();
        }