Apple fixes some bugs with a minor update to iTunes 9.2 making it iTunes 9.2.1. One of the features of the update is that it will disable “older versions of some incompatible third-part plug ins'.
Some of the other resolved issues are fixes to address minor issues with dragging and dropping items within iTunes, as well as fixing a performance issue after syncing to some devices for the first time with iTunes 9.2, an issue with upgrading to iOS 4 on iPhones and iPod touches with encrypted backups, and the requisite improvements for “stability and performance.”
iTunes 9.2.1 requires Mac OS X 10.4.11 or later to run, just like iTunes 9.2. You can update via Mac OS X's Software Update feature, or from Apple's support Website.