Go to your LW library & look at the Uploads column. The first figure shows successful uploads & the second figure shows attempted uploads. So if you see 3/4, it means 3 uploads were successful out of 4 attempts.

Do you see the firewall icon (brick wall in front of the blue globe)? Within LW go tools > options > bug reports > view example. Scroll down to 'recieved incoming this session'... is it true or false? If it's false then there's a firewall preventing people from downloading your files.

In this case, check that you're only using 1 software firewall & that it's configured properly. There's a lot of info about firewall problems within the thread below
Connection problems? Check here first!