In LW go tools > options > bug reports > view example. Scroll down to 'recieved incoming this session'... is it true or false? If it's false, there's a firewall somewhere that's preventing other people from downloading your files.

Don't turn off your software firewall, just configure it for LW (only use 1 software firewall!).
Firewall setup

Your LW's probably detecting an internal firewall within your modem/router. See the sections about enabling UPnP & port forwarding in the thread below for solutions
Connection problems? Check here first!

Downloading at ethernet speed just means that you're downloading from someone on your LAN!