The SANS InfoSec community has been busy with notifications that some recent February 2015 Windows patches pushed from Microsoft are doing bad things.
- Microsoft Patch Mayhem: February Patch Failure Summary - InfoSec Handlers Diary Blog
- Microsoft February Patch Failures Continue: KB3023607 vs. Cisco AnyConnect Client - SANS Internet Storm Center
- Microsoft Patches appear to be causing problems - SANS Internet Storm Center
The top link is the best for a quick rundown of the problematic patches and impacts.