k .. unfortunately your mac is not compatible with LW 5 due to it not having Java 1.6. If you open your Java preferences found in your utilities folder you can confirm this for yourself; Setting up Java for Leopard (see 2nd image)

What you need to do is downgrade back to LW 4. http://www.gnutellaforums.com/mac-os...ck-lw-4-a.html. Personally I'd recommend LW 4.16 rather than 4.18 but that's up to you. If you wish to know how to get 4.16 & what to do, just ask.
(Why LW 4.16? (1) continues LW 5 incompletes whereas LW 4.18 cannot, (2) both LW 5 & 4.18 prevent versions earlier than 4.14 connecting to them thus blocking out a portion of the network. LW 4.16 connects with versions at least as early as 4.8.1; thus, getting best of both worlds. (3) LW 4.18 had other buggy issues that were complained about at the time of its release, a change in its downloads preferences location & download location disrupted the program.)