Windows 11 updated to 26220.8138 - Emby app wont open - Application Error / .NET Runtime

[Sulphy 1]

Ok, so my Windows 11 updated this morning, and now Emby wont open. (Windows 11 Pro 25H2 - 26220.8138)

Tried uninstalling, reboot, re-install multiple times.. same issue persists. Tried opening the app multiple times, rebooted multiple times. 

Was working before the update to Windows 11 - 8138.

Emby Server version: 4.9.3.0 - Server is working fine - (Windows Server 2025 Std 24H2 - 26100.32522)

 

Event 1000 - Application Error:
Faulting application name: Emby.Client.WinUI.exe, version: 2.234.0.0, time stamp: 0x670d0000
Faulting module name: KERNELBASE.dll, version: 10.0.26100.8134, time stamp: 0x6ef2d36c
Exception code: 0xe0434352
Fault offset: 0x00000000000c717a
Faulting process id: 0x26B4
Faulting application start time: 0x1DCC0EF02E03403
Faulting application path: C:\Program Files\WindowsApps\EmbyMedia.EmbyTheater_2.234.2.0_x64__svmepx4c03f7m\Emby.Client.WinUI.exe
Faulting module path: C:\WINDOWS\System32\KERNELBASE.dll
Report Id: e496b64a-85be-48ff-aacc-831ca29e35b2
Faulting package full name: EmbyMedia.EmbyTheater_2.234.2.0_x64__svmepx4c03f7m
Faulting package-relative application ID: App

 

Event 1026 - .NET Runtime:
Application: Emby.Client.WinUI.exe
CoreCLR Version: 6.0.3624.51421
.NET Version: 6.0.36
Description: The process was terminated due to an unhandled exception.
Exception Info: System.Runtime.InteropServices.COMException (0x803E0105): The notification platform is unavailable.

The notification platform is unavailable.

   at WinRT.ExceptionHelpers.<ThrowExceptionForHR>g__Throw|38_0(Int32 hr)
   at WinRT.ExceptionHelpers.ThrowExceptionForHR(Int32 hr)
   at ABI.Microsoft.Windows.PushNotifications.IPushNotificationManagerMethods.Register(IObjectReference _obj)
   at Microsoft.Windows.PushNotifications.PushNotificationManager.Register()
   at Emby.Client.Application.WinUI.Services.Push.PushReceiverWinUI.StaticInit()
   at Emby.Client.WinUI.Program.Main(String[] args)
 

Any idea's? 

Much appreciated... thank you!

[Luke 42246]

HI, we'll take a look at it. Thanks for reporting.

[butterkitty 1]

I actually was able to fix this on mine by going into Windows Update -> Advanced Options -> Recovery -> Reinstall Now

It took a bit, but it reinstalled 25H2 and now it works. I did reset the emby app completely before i did, but I think that's unrelated. I have a feeling that Microsoft broke the Windows Push Service with this past update and the repair fixes it.

I could be wrong tho

[Sulphy 1]

Good call, didnt think to try that.

So, did a re-install, and same issue still! Am going to try roll-back to a previous build of windows, and see where we are at then!

[Sulphy 1]

Good call, didnt think to try that.

So, did a re-install, and same issue still! Am going to try roll-back to a previous build of windows, and see where we are at then!

Edit: Dangit!!!! Because i did a re-install... cant roll back to a previous build! Will have to look at doing a full re-install of Window.. will have to be this weekend tho!
In the meantime, if there is anything else i can provide @Luke.. please do let me know!

Thanks all...   

[softworkz 5133]

On 3/31/2026 at 11:29 AM, Sulphy said:

Ok, so my Windows 11 updated this morning, and now Emby wont open. (Windows 11 Pro 25H2 - 26220.8138)

Tried uninstalling, reboot, re-install multiple times.. same issue persists. Tried opening the app multiple times, rebooted multiple times. 

This is a Windows Insider Preview version. When you are running these, errors like the one you are seeing must be expected. It's not an Emby issue.

[RanmaCanada 502]

Edition    Windows 11 Pro
Version    25H2
Installed on    ‎2025-‎02-‎26
OS build    26200.8037
Experience    Windows Feature Experience Pack 1000.26100.300.0

Same problem here. Emby Theatre just loads to a black screen and hangs.

[TMCsw 260]

1 hour ago, RanmaCanada said:

Same problem here. Emby Theatre just loads to a black screen and hangs.

That's the:

1 hour ago, RanmaCanada said:

Windows Feature Experience

Have fun!

[Happy2Play 9814]

Not seeing an issue here connecting to 4.9.3.0 or 4.10.0.8.

Edition	Windows 11 Pro Insider Preview
Version	25H2
Installed on	‎1/‎31/‎2026
Evaluation expires on	‎8/‎11/‎2026 11:09 AM
OS build	26300.8142
Experience	Windows Feature Experience Pack 1000.26100.345.0

 

[scottpro 15]

You can try uninstalling that Windows update.

To uninstall a Windows KB update, go to Settings > Windows Update > Update history. Scroll down to  "Related settings" and select Uninstall updates.

Select "KB5079491" (Windows 11 Insider Preview Build 26220.8138) and click "Uninstall".  That should take you back to the previous Windows OS build.

See if that helps.

FYI,

• KB5079491 is for the Beta Channel 26220.8138
• KB5079492 is the the Dev Channel 26300.8142