Yesterday’s update to Tiger does not address the iChat issues that many newly upgraded users are having, and this new support article, “iChat AV 3.0: ‘Insufficient bandwidth’ messages,” indicates why. The article suggests that iChat’s newly added QoS features are (irony alert) breaking the iChat experience for many users, since the DSCP used to implement the feature is blocked by some ISPs.
Question: what do you call a change to an application that breaks existing functionality for many users? Where I work, we call that a regression bug, not a feature.