Recently we learned of an issue that could have impacted an extremely small number of people who had already installed Windows 10 and applied the November update (Version 1511). When the November update was installed, a few settings preferences may have inadvertently not been retained for advertising ID, Background apps, SmartScreenFilter, and Sync with devices. This issue has been fixed in the update that accompanies KB3120677.
For those customers who previously installed the November update (Version 1511), we are working to help restore their previous settings over the coming days and we apologize for the inconvenience. In the meantime, users interested in checking their settings can find them by going to Settings, then Privacy.
Select General to adjust the advertising ID and SmartScreen Filter.
Select Other devices to adjust your Sync with devices settings.
Select Background apps to review the applications set to run in the background.