Forum Discussion

donho's avatar
donho
Copper Contributor
Nov 14, 2024

[BUG] Windows 11 Taskbar thumbnail live previews show previously closed dialogs

When hovering over the taskbar icon of some applications then hovering over a window's thumbnail, the "live preview" will show dialogs that were previously open but have since been closed on some machines/setups.

 

Obviously, it's a bug of Taskbar under Windows 11, due to WS_DLGFRAME which is using by dialogs in question. The POC file can be downloaded here:  
https://github.com/user-attachments/files/17412665/PreviewBugPOC.zip

More detail can be found in GitHub:
https://github.com/notepad-plus-plus/notepad-plus-plus/pull/15703

Application Management

2 Replies

  • Eorku's avatar
    Eorku
    Iron Contributor
    Aug 14, 2025

    Update your graphics card driver and restart the explorer.exe process to fix the issue of thumbnail previews displaying residual content in the taskbar.

    • donho's avatar
      donho
      Copper Contributor
      Mar 16, 2026

      Hi Eorku,

      Thank you for your answer.

      We tested the same scenario on another PC running Windows 11 25H2 (build 26200.8037) with GPU drivers from late 2025, and the problem persists. 

      The bug also affects Windows 10. And since Windows 10 is practically at end of life and runs on many older PCs that cannot receive new GPU drivers, I don’t think that proposed solution is correct.

      This is clearly a Microsoft Windows bug, not a GPU driver issue.