On Thursday, Apple released a rare supplemental update to OS X Yosemite 10.10.3 that resolves a bug in a video driver that was causing some Mac owners to report startup issues or even full-blown kernel panics "when running certain apps that capture video," said the company. Users were reported longer-than-normal startup times or crashes. Not fixed by the new update are scattered reports of problems opening large JPEG files using Preview of QuickLook, but this is again not a universal issue.
