I can't find MR thread at the moment but apparently this update breaks Nvidia drivers for certain graphics cards.
I can confirm that. Applied the Yosemite update (on 10.10.1) and on reboot screen is jumbled. Clicking the mouse in vicinity of usual icons activates something so this suggests OS & applications are ok just the video drivers. I've no idea how to undo - any suggestions? If I can't find an easy way then its backup restore time.
Booting in safe mode shows everything else is working fine except video drivers. Curiously OS X now reporting as 10.10.2 even though I have not applied that update - just the security update.
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