OK, LimeWire cannot crash this way (e.g. caused by a bug in LimeWire) but the JavaVM can (and if the VM crashes then crashes LimeWire as well). You say you had other problems with OSX and applications? Random crashes etc. etc.? This could be an indication for a memory problem. Keep an eye on the Console and see if it's always an EXC_BAD_ACCESS error. In case you don't fear the Terminal I can tell you how you can push your memory to the limits which hopefully uncovers a memory problem (the Hardware Test CD/DVD is inaccurate).