I have a Windows 8.1 user who has a new issue as of yesterday. In Devices and Printers, the green check mark for default printer is missing. He can right-click on a printer and select "select as default printer" and nothing seems to happen. If he is in an application like Word and clicks Print, he is shown the first printer (alphabetically), not the one he specified as default. I've looked in the registry, and the correct printer is listed as the default. The print spooler seems to be working correctly, as he can print to whichever printer he wants. He just can't specify a default printer. I've logged on to his laptop with my credentials and I can select a default printer just fine, so I know that it is something unique to his user profile.