After a little over a week since the public release of OS X Yosemite 10.10.3, Apple is now pushing a supplemental update to fix a video driver issue that prevented certain users from booting when certain video capture apps were used.

The change log states:

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.

Most users probably didn’t experience an issue, but it’s recommended to stay on the latest software for your Mac.