I yet don't know the difference RunLime.jar and LimeWire.jar but they both run the same and well without errors on my system. I can only run the commandline runLime.sh and not LimeWire the executeable. I have a hunch. Can you post all your compilers (rpm -qa|grep gc)? I think a library called libgcj and gcc-java maybe the true culprits. I had a brain fart in the previous post but now I am remember while java path was added into the .bashrc or .bash_profiles. It is added to allow you to have your downloaded java package to be chosen over any other first. Kaffe has residence in /usr/bin. When I had given you the suggestion for your tcsh shell environment, I should have explicitly stated that JAVA_HOME had to be first in your set path. Or simply instead of using the variable JAVA_PATH, just simply place the full path to your java executables like so:

set path = ( . /usr/java/j2jre1.4.0/bin, /usr/bin, /usr/sbin )

That way, no matter how many java jre and sdk packages you have installed the one you want used with LimeWire 2.4 will be chosen by default.