Ah, thought this might be the problem, it was after an update (can't remember which one, but one that came with 10.4.2) that Limewire failed to open. I did all the things suggested by Lord of the Rings, and also downloaded the new Security update and restarted, still won't open. I've downloaded the latest version of Limewire too but still no success. Is there any other tweak I've missed? Cheers