If you're using NinjaTrader and your orders are delayed or are not going through, it may be that your connection adapter needs to be fixed. One thing to try is another adapter if you have one.
If you log into NinjaTrader with a password, as is required with the latest version, then you can try the NinjaTrader connection adapter (vs. the NinjaTrader Continuum adapter, for example).
To try this adapter, select Connections, then configure, and select the NinjaTrader connection and add it. Configure it for your login credentials, and optionally have it automatically connect on startup. You may need to uncheck the connect on startup box for your other default connection. Test out the new adapter to see if things improve.
Contact NinjaTrader support if you need assistance with this or have any other issues with orders or the platform in general.