You're going to make me cry. Make sure again that your firewall is set up right. Did you go into options & select UPnP again? Make sure that the listening port number is still the same as originally (because that's the port number you've allowed through your firewall). If you find that the port number's changed, change it back & give LW time to settle again.
It might be time to try port forwarding
I don't know what's going on with your set up or why this is happening.