iTunes 10.0.1 breaking AirPlay
A few people who have installed the latest version of iTunes (version 10.0.1) have found that their remote speakers are no longer working. This reflects similar reports that came out when people upgraded from iTunes 9.2.1 to the initial release of iTunes 10.
The problem may be hard to pinpoint, but so far people have had success in turning off the system firewall or reinstalling the program; however, removing relevant preference files may also help.
Toggle or turn off firewallTo turn off the firewall, in OS X 10.5 Leopard go to the Security system preferences … Read more