Late on Thursday, Apple released yet another build (12D74) of OS X 10.8.3 to developers for testing, though as with recent revisions there appears to be no significant code changes, and no new release notes or immediately-obvious differences. As before, Apple is asking testers to focus on graphics drivers, AirPlay, AirPort, Safari and Game Center. The company has already fixed a strange "file URL" bug that would cause all kinds of applications to spontaneously quit when the phrase "File:" followed by three slash marks was written, but has not yet released 10.8.3 to the public.