Following the release of OS X Mavericks Developer Preview 3 earlier this week, and a second OS X Recovery preview update for the release a few days later, Apple has now released yet another bug fix to developers for DP3. The update is intended to repair an issue that could cause Macs running Mavericks to randomly reboot without warning.
The update, called Mavericks Preview 3 Graphics Update 1.0, is a relatively minor one, and is available immediately through Software Update (via the Mac App Store) on all Macs running Developer Preview 3.