Im also having the same problem as this. I have recently updated my LW version, and also upgraded my broadband from 2meg to 8meg, not sure which one may be the problem.

1. Windows XP
2. Windows Firewall, also running Avast Anti-virus but this has been no trouble before.
3. 512mb DDR400
4. Not sure?
5. Broadband
6. Intel 537EP V9x DF PCI Modem, Speedtouch 330 router
7. House
8. Limewire 4.12.11 Java 1.5.0_03
9. Homecall Broadband (Pipex)
10. Your test worked!
11. No
12. Used previous versions fine.
13. Yes, but have tried adding an exception to windows firewall

Any help would be greatly apprieciated!