We get under the hood of the latest OS X update and discover some new features The most significant thing about what's changed in OS X 10.5.4 may be what hasn't changed with Monday's release of the OS X update. The ARDAgent security hole - discovered just a few weeks ago - remains unplugged. This actually isn't all that surprising-if the chatter around the Internet is to be believed, Apple has been working on the 10.5.4 update for quite a while, predating the discovery of the ARDAgent issue. System updates are complex things with many inter-related parts, and adding in a fix for the ARDAgent issue would have required more testing, and perhaps delayed the release of 10.5.4.
