Apple Releases OS X 10.10.3 Supplemental Update
Apple has today released a supplemental update for users on OS X 10.10.3. This update brings a fix to certain video drivers. The bug made it so some Macs would not start when certain apps were running that capture video. According to Apple, that bug has been fixed in this update.
Those interested can update in the Mac App Store > Updates > Software updates > OS X 10.10.3 supplemental update.