Hi there, thanks for all the ideas so far, i just don't understand this, it was working fine before i upgraded LW! Right, I've reinstalled Quicktime 7.0.1, used disk utility to repair permissions and made sure I'm using Java 1.5.0_05 yet still i get the fatal error report! I've posted the most recent one below (sorry about all these lengthy posts..)

LimeWire version 4.10.5
Java version 1.5.0_05 from Apple Computer, Inc.
Mac OS X v. 10.4.4 on ppc
Free/total memory: 18452352/19726336

FATAL ERROR!

java.lang.VerifyError: (class: org/apache/log4j/LogManager, method: <clinit> signature: ()V) Incompatible argument to function
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:164)
at com.limegroup.gnutella.util.CommonUtils.isLog4JAva ilable(CommonUtils.java:567)
at com.limegroup.gnutella.gui.Initializer.initialize( Initializer.java:85)
at com.limegroup.gnutella.gui.GUILoader.load(GUILoade r.java:41)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Native MethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at com.limegroup.gnutella.gui.Main.main(Main.java:44)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Native MethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at apple.launcher.LaunchRunner.run(LaunchRunner.java: 88)
at apple.launcher.LaunchRunner.callMain(LaunchRunner. java:50)
at apple.launcher.JavaApplicationLauncher.launch(Java ApplicationLauncher.java:52)


-- listing session information --
Current thread: main
Active Threads: 5

-- listing threads --
main: 1
AWT-AppKit: 1
AWT-EventQueue-0: 1
AWT-Shutdown: 1
Image Fetcher 0: 1


-- listing properties --
LAST_EXPIRE_TIME=1138047400164