Following the April 8 public release of OS X 10.10.3, Apple has today released a supplemental update for software



From MacRumors:

Today's supplemental update is available immediately for all OS X Yosemite 10.10.3 users from the Mac App Store.The OS X Yosemite 10.10.3 Supplemental Update fixes a video driver issue that may prevent your Mac from starting up when running certain apps that capture video.OS X 10.10.3 brought several new features to Apple's desktop operating system, including the new Photos for OS X app, a revamped emoji picker, new diversified emoji, Spotlight suggestions for lookup, and a bunch of bug fixes and performance improvements.

  Apple Releases OS X 10.10.3 Supplemental Update With Video Driver Fix