Then try deleting LW preferences found here /Users/your_username/Library/Preferences/LimeWire
If still not work, try downlding the newest beta here
Lime Wire » Download LimeWire Beta
BTW are you using Java 1.4.2 or 1.5? It's highly recommended to use 1.5 & force LW to use Java 1.5 (
J2SE 5.0 = Java 1.5). You do this by opening the Java utility found in the Utility folder & opening the J2SE 5.0 folder & opening the Java Preferences & putting Java 1.5 at the top of the list. Save your settings of course! More about this here
About Java 2 Platform Standard Edition (J2SE) 5.0 Release 1 for Tiger 