Some info on your setup would be nice (like your router manufacturer/model, private net setup, etc).

Have you had any extended power outages in June? It could be possible that your settings were lost in one.

Check to make sure your ports are still being forwarded properly for BitTorrent (Default ports: 6881-6889 for older BT prior to 3.2 and 6881-6999 on 3.2 and after.)

If you have your router set up for NAT, it should work fine.

And what exactly do you refer to for the "green light"?