iTunes 9 causing AirTunes connection problems?

A number of iTunes users are reporting problems getting iTunes’ AirTunes feature to work with their Airport Express units after upgrading to iTunes 9. Based on user reports in an Apple Discussions thread, the problem does not appear to be isolated to any specific operating system or Airport Express model, as both Mac and PC users, and owners of both 802.11g- and 802.11n-capable Airport Express units say they have been getting an error message stating, “An error occurred while connecting to the remote speaker ‘[Airport Express Name]’. The network connection failed.” Curiously, a number of users reported similar problems after installing iTunes 8. [via Engadget]