I recently install Windows 10 Pro and updated it to anniversary edition, after logging into our domain I noticed that Windows Spotlight had stopped working and the preview screen was grey.
Should this happen to you try the following solution:
- In Personalization->Lock Screen settings change Background to Picture.
- Delete everything from folder
C:\Users\<USERNAME>\AppData\Local\Packages\Microsoft.Windows.ContentDeliveryManager_<somerandomcharacters>\Settings - In Personalization->Lock Screen settings change Background back to Windows Spotlight
