People with launching problems see Sticky in mac osx forum section.

nick112 have you configured your OSX firewall to allow LW full access, see: http://www.limewire.com/english/content/firewalls.shtml

You might try changing the ports LW uses or/& forward a port (open a port.) LW Prefs>Advanced>Firewalls. For port forwarding see: http://www.portforward.com/netopia/Cayman3300.htm (these are for windows version but use same principle or see manual to your device.) But you must set up a Static ip 1st for this to work. So the steps are: 1. Set up a Static ip. 2. Forward a port. 3. Manual port forward instructions & sample image & 2 posts after that. The default port for LW is 6346 but this can be changed to something else. If it is changed then listening port, any port forwarding & any firewall clearance should allow the new port no.

Some devices require rebooting after such changes but I don't know about yours.