I am having the same problem. I am however not using the pro version of Limewire. I am using MacBook Intel with OS10.4.10, 2gHz Intel Core Duo, 2 Gb of RAM, I have a DSL connection, Limewire Version 4.14, Java 1.4.2. I start up, get the obnoxious "do you want to upgrade to Pro", say later, and the program immediately shuts down. Get message "Limewire Has Unexpectedly Quit." It is not longer unexpected by me. BTW, I live in Italy.