Freshly Exhumed writes: Microsoft has told The Inquirer that it is aware of a bug which has been causing users' default programs to switch to the bundled Microsoft options. After deleting the update, a user discovered the next day that Windows had reinstalled it and reset the default settings again. InfoWorld gives some real world scenarios: "If you have Chrome as the default browser on your Windows 10 computer, you'd better check to make sure Microsoft didn't hijack it last week and set Edge as your new default. The same goes for any PDF viewer: A forced cumulative update also reset PDF viewing to Edge on many PCs. Do you use IrfanView, ACDSee, Photoshop Express, or Photoshop Elements? The default photo app may have been reset to -- you guessed it -- the Windows Photos app. Music? Video? Microsoft may have swooped down and changed you over to Microsoft Party apps, all in the course of last week's forced cumulative update KB3135173."