I've got the same problem, the uploads are working but I cannot start any downloads. If I look at the Statistics there are:

17900 total messages
10000 local searches
4058 routing errors
4402 dropped messages

I've got 4 uploads but 0 downloads

some weeks ago evrything was working fine, I didn't change anything

My system:
Athlon 900 Mhz
256 Mb DDR RAM
Windows 2000 Server SP 2

Internet connection:
T-Online T-DSL flat
direct connection (no dialing Software)
no proxy
no firewall
Servertype: PPP
Authentification: PAP
TCP/IP