After installing the KB4534310 from “Patch Tuesday” update, supposedly to be the grand final update, security of otherwise, for Windows 7 and Windows Server 2008 R2 as the extended support ends on January 14, 2020, the system may experience an unexpected Desktop wallpaper issue.

The issue involves bug that may cause Desktop wallpaper to display as black background when the fit is set to Stretch.

To mitigate the issue while waiting for Microsoft to provide a hotfix to resolve the bug, Microsoft suggests the following workarounds in the known issue of KB4534310:

  • Set your custom image to an option other than Stretch, such as Fill, Fit, Tile, or Center.
  • Choose a custom wallpaper that matches the resolution of your desktop.

As the result of the bug, Microsoft will provide an update in an upcoming release, which will be released to all system running Windows 7 and Windows Server 2008 R2 SP1 automatically via Windows Update, even though Windows 7 and Windows Server 2008 R2 is no longer been supported, except for organizations that purchased the Extended Security Updates (ESU) for three more years of support.

Update: Microsoft publishes official hotfix KB4539602 to patch the bug.