Though the news of this update problem with Windows 10 is sad on a variety of levels, I share it here primarily because it demonstrates a serious problem with the cumulative patching approach Microsoft has adopted.  These types of problems are going to cause more and more people to lose faith in the patching process, building the assumption that patches break more things than they fix.  There was a similar mentality in the early builds of Windows 95.  This is bad…very bad.  Security updates are critical and need to be trusted by consumers.

http://www.infoworld.com/article/3111928/microsoft-windows/windows-10-cumulative-update-kb-3176934-breaks-powershell.html