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SuperNova Displays Black Screen on Windows Lock Screen After Installing KB5120998

Issue resolved in SuperNova and Dolphin ScreenReader 25.06 for Windows 11 25H2 systems with KB5120998 installed.

Some users previously experienced an issue when locking their computer while Dolphin SuperNova or Dolphin ScreenReader was running. Instead of the standard Windows lock screen appearing, the screen remained black with the Dolphin focus highlight visible. In this state, the lock screen could not be interacted with and users were unable to sign back in normally.

This issue was identified as being triggered by Windows Update KB5120998 on affected systems.

Affected Configurations

The issue was reproduced under the following conditions:

  • Operating System: Windows 11 25H2
  • Product Version: SuperNova 25.05 Build 3954
  • Windows Update: KB5120998 installed

Symptoms

After locking the computer:

  • The display showed a black screen.
  • The Dolphin focus highlight remained visible.
  • The Windows lock screen did not render correctly.
  • Keyboard interaction with the lock screen was unavailable.

Cause

Investigation determined that Windows Update KB5120998 could prevent the Windows lock screen from displaying correctly when SuperNova or Dolphin ScreenReader was running on affected Windows 11 25H2 systems.

Resolution

Fixed in SuperNova and Dolphin ScreenReader 25.06

This issue has been resolved in SuperNova and Dolphin ScreenReader version 25.06.

Users affected by this problem should update to the latest 25.06 release or later. Once updated, the Windows lock screen should display and function normally, even when KB5120998 is installed.

Recommended Action

To resolve the issue:

  1. Update SuperNova or Dolphin ScreenReader to version 25.06 or later.
  2. Restart the computer after installation if prompted.
  3. Verify that the lock screen displays correctly when locking Windows.

If you continue to experience lock screen issues after updating, please contact Dolphin Support and provide your product version, Windows build number, and details of any recent Windows updates installed.

Status

✅ Resolved

Dolphin successfully reproduced the issue, identified the interaction with KB5120998, and implemented a fix in SuperNova and Dolphin ScreenReader 25.06.

Additional Information

Users who previously uninstalled KB5120998 as a workaround can reinstall the update after upgrading to SuperNova or Dolphin ScreenReader 25.06, subject to their organisation's update policies.

This article was last updated 21/10/2026.