topic Re: Unable to run Fusion in Fusion Support Forum

Unable to run Fusion

m_litwinczuk — Fri, 21 Nov 2025 18:08:52 GMT

After upgrade from Windows 10 to 11 program doesn't start - always are hangs. Content of the window is alvays freezed. I reinstalled it, removed keys from registry, removed data from AppData, installed latest GPU drivers. Without success.

Re: Unable to run Fusion

RajkumarIlanchelian — Fri, 21 Nov 2025 18:25:03 GMT

@m_litwinczuk Can you please give us log files?

Go to add/remove programs- select Fusion - MODIFY
This will launch the service utility
gather system info
Attach the Fuiondiagnosticslogs.zip

Re: Unable to run Fusion

m_litwinczuk — Fri, 21 Nov 2025 18:43:13 GMT

1. Tried to repair. Still same freeze.

2. Tried to reset too. This is second view of the freezed window.

Re: Unable to run Fusion

RajkumarIlanchelian — Fri, 21 Nov 2025 18:45:13 GMT

@m_litwinczuk Ok . This helps. So you are able to launch it but then it does not connect to give you the modeling ready space. Let me check the logs.

Re: Unable to run Fusion

m_litwinczuk — Fri, 21 Nov 2025 18:47:08 GMT

Program is starting.

Asking to authenticate.

And after this... you have screens.

There is also a third state. Doesn't run - window is not showing up but I see tool to report problem.

Re: Unable to run Fusion

RajkumarIlanchelian — Fri, 21 Nov 2025 19:01:19 GMT

@m_litwinczuk There seems to be a filelock that could be causing the issue. Can you go to the below folder and check the permissions you have on that folder?

Filepath:***\AppData\Local\Autodesk\Neutron Platform\Filelock

This is the folder that seems to be locked.

Re: Unable to run Fusion

m_litwinczuk — Sat, 22 Nov 2025 06:50:43 GMT

All files are created today. I've removed all files recently.

Removed all.

Started again. Still freezed.

Started again. This time program window doesn't show up. Just error.

Started again... And still dying.

Re: Unable to run Fusion

lance.carocci — Fri, 21 Nov 2025 23:33:11 GMT

Hi @m_litwinczuk, all your recent crash reports seem to indicate Nvidia drivers as the root cause of the crash. That said, we don't know what's making the drivers crash. Is your 4090 overlocked? Is your RAM overclocked? If you are using GameReady drivers, have you tried Studio? While it's not guaranteed these are contributing factors, it would help to rule them out.

Re: Unable to run Fusion

m_litwinczuk — Sat, 22 Nov 2025 06:11:03 GMT

No, my card isn't overclocked, RAM also doesn't.

Before I've migrated to Win 11 everything works fine, without any problem.

I don't have situations like this with any game or program.

But - for you - I've reinstalled now NVidia Studio with clean install.

Still doesn't work. Same issues.

Re: Unable to run Fusion

m_litwinczuk — Sat, 22 Nov 2025 06:49:01 GMT

Problem solved. Thank you all for help.

The culprit is Mirilis Action. I've seen this happen before with some UE5 games – it would start up and then crash after a while. Back then, I had to record in windowed mode (which worked).

However, I never had any problems with Fusion while working on Windows 10. Before updating to Win 11, I updated the BIOS to the latest version. From what I can see on Furmark, the integrated GPU was also active. I turned it off, but it didn't help.

However, I remembered about game recording. I switched Mirilis Action to window recording mode - and voila - it helped! I added Fusion to the ignored processes, reset the computer - and now it works without any problems.

Re: Unable to run Fusion

lance.carocci — Tue, 02 Dec 2025 01:35:58 GMT

Thanks for following up @m_litwinczuk! We have seen similar crashes in the past with other apps that hook into the graphics scene (such as to inject an overlay). While there is little we can do to prevent apps from hooking into Fusion, I will see if we can try to detect and message users of this conflict in the future.