Symptom
Under certain conditions audio playback skips. This may happen when playing MP3 files with any MP3 player application, but is especially apparent during network activity, such as viewing Web pages using Internet Explorer.
Solution
Download and install Mac OS X 10.1.2 or later. Use the Software Update pane of System Preferences, or download the update from Apple Software Downloads (
http://www.apple.com/swupdates/).