@ m15

what type of security do you have setup on your mac? is it just the mac firewall, or have you any other 3rd party firewalls.

if you are running it and you followed my steps when it loads, then the system should flag up to allow incoming / outgoing connections via media link and a yes / no dialog. i have reloaded my mac many times since i have had the software, and used various 3rd party firewalls, and not had an issue.