Post your details

OS(Win XP etc)
LW & Java version (help > about LW & you'll see)
Firewall you're using
Modem/router brand & model
ISP
Connection type (DSL etc)
Where you connect from (home, school etc)
Are you sharing a connection with other computers
Is this your first try with LW

We need to find out who your ISP is because it sounds like they could be using traffic shaping. Having 2 p2p apps with the same problem sounds ominous! Many ISPs are doing this now & most don't give their customers any warning.