Apple just posted a couple of tiny updates to both OS X and iOS versions of Airport Utility, bringing the Apple-branded router setup and management utility to version 6.3.1. The patch apparently fixes a bug that would keep AirPort base stations from being detected in some cases. It’s a little under 22 M to download, and can be downloaded from Apple’s support site, Software Update, and the iTunes App Store, if the iOS version is the one you need.
If you’re rockin’ OS X Mavericks beta, you’ll also see a new update for the as-yet-unreleased beta software. This should fix some sort of problem with the Recovery Mode, though the details are light at this point as to what, specifically, is being fixed. It will show up in Software Update, too..