I installed Norton Security (version 7.1) on my Macbook Air and when I try to import my iTunes library on the Sonos application, Norton blocks the operation. I have tried to modify the firewall but when I go to the settings, the firewall isn't even activated for applications. I have looked online for solutions, but they only seem to exist for older versions of Norton and for PCs. Does anyone know how to stop Norton blocking this operation? Thanks!