DisplayFusion RSS: DF 11.2 beta 5 doesn't run after Win11 cumulative updates for Sep 2025 https://www.displayfusion.com/Discussions/RSS/?TopicID=01993576-6a17-7315-8270-2acf60b12f1d DisplayFusion RSS: DF 11.2 beta 5 doesn't run after Win11 cumulative updates for Sep 2025 Fri, 17 Apr 2026 00:53:12 GMT en hourly 1 https://www.displayfusion.com/Discussions/RSS/?TopicID=01993576-6a17-7315-8270-2acf60b12f1d RE: DF 11.2 beta 5 doesn't run after Win11 cumulative updates for Sep 2025 https://www.displayfusion.com/Discussions/View/df-112-beta-5-doesnt-run-after-win11-cumulative-updates-for-sep-2025/?ID=01993576-6a17-7315-8270-2acf60b12f1d#3 Thu, 11 Sep 2025 20:46:10 GMT Binary Fortress Software https://www.displayfusion.com/Discussions/View/df-112-beta-5-doesnt-run-after-win11-cumulative-updates-for-sep-2025/?ID=01993576-6a17-7315-8270-2acf60b12f1d#3 DisplayFusion That was it! I did a repair install of .NET 8.0.20 and that file was no longer empty and DF is running again. ]]> RE: DF 11.2 beta 5 doesn't run after Win11 cumulative updates for Sep 2025 https://www.displayfusion.com/Discussions/View/df-112-beta-5-doesnt-run-after-win11-cumulative-updates-for-sep-2025/?ID=01993576-6a17-7315-8270-2acf60b12f1d#2 Thu, 11 Sep 2025 17:15:20 GMT Binary Fortress Software https://www.displayfusion.com/Discussions/View/df-112-beta-5-doesnt-run-after-win11-cumulative-updates-for-sep-2025/?ID=01993576-6a17-7315-8270-2acf60b12f1d#2 DisplayFusion Sounds like your .NET 8.0.20 Windows Update failed.

The listed file should not be empty, mine has the following:

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{
  "runtimeOptions": {
    "tfm": "net8.0",
    "rollForward": "LatestPatch",
    "framework": {
      "name": "Microsoft.NETCore.App",
      "version": "8.0.20"
    }
  }
}

There is likely other files that could be corrupted, so I would recommend reinstalling .NET 8.

.NET Core is not part of the OS unlike the .NET Framework, so OS level reinstalls such as sfc or dism probably won't work. ]]> DF 11.2 beta 5 doesn't run after Win11 cumulative updates for Sep 2025 https://www.displayfusion.com/Discussions/View/df-112-beta-5-doesnt-run-after-win11-cumulative-updates-for-sep-2025/?ID=01993576-6a17-7315-8270-2acf60b12f1d Wed, 10 Sep 2025 21:09:37 GMT Binary Fortress Software https://www.displayfusion.com/Discussions/View/df-112-beta-5-doesnt-run-after-win11-cumulative-updates-for-sep-2025/?ID=01993576-6a17-7315-8270-2acf60b12f1d DisplayFusion Last night my Surface Laptop installed the Patch Tuesday updates for Windows 11 which included:

    - 2025-09 Cumulative Update for .NET Framework 3.5 and 4.8.1 for Windows 11, version 24H2 for x64 (KB5064401)
    - 2025-09 Cumulative Update for Windows 11 Version 24H2 for x64-based Systems (KB5065426) (26100.6584)
    - 2025-09 .NET 8.0.20 Update for x64 Client (KB5066233)
    - 2025-09 .NET 9.0.9 Update for x64 Client (KB5066234)

Now today, DisplayFusion won't run. I found this in the Event Log:

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Description: A .NET application failed.
Application: DisplayFusion.exe
Path: C:\Program Files\DisplayFusion\DisplayFusion.exe
Message: A JSON parsing exception occurred in [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.20\Microsoft.WindowsDesktop.App.runtimeconfig.json], offset 0 (line 1, column 1): The document is empty.
Invalid framework config.json [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.20\Microsoft.WindowsDesktop.App.runtimeconfig.json]


I tried re-installing Beta 5 over itself but that didn't help. How can I fix this? Something with the new .NET? ]]>