Tranceliner
Well, it's quite obvious that your new modem/router is the current cause of your firewall problem and, at this stage, it may not be a bad idea to go back to your USB modem. I know that when I moved from USB modem to modem/router I also went from black to grey hair then to no hair at all


If you want to stay with your new modem/router then in order to use LW, or any other P2P app, you will have to use the PORT FORWARDing instructions. But is you want an easier life (and keep your hair) try your USB modem again.
UK Bob