topic Fusion not starting up on Mac OS 15.3 in Fusion Support Forum

Fusion not starting up on Mac OS 15.3

murray_miskelly — Tue, 19 Aug 2025 22:15:28 GMT

I am running Fusion on a MacBook Pro. (I am the only user on the machine, and am the administrator)

After install I can run the app once, and then if I quit the app it won't initialise again.

The icon appears in the dock to say it is initialising, but immediately the 'active dot' disappears. I get the same occurrence when trying to run the Service Utility.

I am on the latest version of Mac OS, and I have fully restarted the machine and still see the issue.

I followed the AutoDesk Assistant suggestions and deleted the suggest .dat file from the application Support folder, but that did not appear to make any difference.
Any further suggestions?

Re: Fusion not starting up on Mac OS 15.3

RajkumarIlanchelian — Wed, 20 Aug 2025 00:40:01 GMT

@murray_miskelly If you go to launchpad and find Fusion and launch Fusion from there, does the same thing happen?

Re: Fusion not starting up on Mac OS 15.3

murray_miskelly — Wed, 20 Aug 2025 01:14:10 GMT

Same result.

Could it be a permissions thing maybe?

Re: Fusion not starting up on Mac OS 15.3

murray_miskelly — Wed, 20 Aug 2025 01:30:24 GMT

Another symptom. When I run the installer and it opens Fusion there is an additional app icon in the dock (see attachment 1). If I trace that back it is running from within the 'webdeploy' folder from within Application Support where the app is 9GB in size (attachment 2).

In my Application folder in the Autodesk Fusion folder there are three icons for Fusion, Service Utility, and Remove Fusion, all less than 200k in size (attachment 3). Is this the normal install?

Re: Fusion not starting up on Mac OS 15.3

RajkumarIlanchelian — Wed, 20 Aug 2025 04:06:03 GMT

@murray_miskelly what yo see are all normal. Lets try a couple of things.

1. First we need log files but since Fusion service utility is not working lets collect the THREE logs manually - https://www.autodesk.com/support/technical/article/caas/sfdcarticles/sfdcarticles/How-to-manually-collect-the-log-files-for-Autodesk-Fusion-360.html

2. Quickly create a new user on this Mac and install Fusion. See if the same behavior happens.

This will start to give us some direction what could be happening.

Re: Fusion not starting up on Mac OS 15.3

shane_huston — Wed, 20 Aug 2025 04:29:17 GMT

I am having this exact problem. I have to reinstall Fusion every time I want to launch it.

Re: Fusion not starting up on Mac OS 15.3

shane_huston — Wed, 20 Aug 2025 04:33:18 GMT

Ah, I went to Launchpad, noticed there are two Fusion 360 icons and two icons for the 360 Service Utility. I tried both and one of them worked.

Re: Fusion not starting up on Mac OS 15.3

RajkumarIlanchelian — Wed, 20 Aug 2025 12:54:34 GMT

@shane_huston Here is a way to clean it all up.

Logout and Close Fusion
2. Go to Launchpad - Uninstall Fusion
3. Go to Users - YOUR USER ID - Applications - delete all the Fusion icons you see in here (you should see two Fusion icons and two service utilities etc)
3. Go to

Macintosh HD>Users>(username)>Library>Application Support>Autodesk>Autodesk Fusion 360>

DELETE the following folders – Webdeploy, Web Services, Identity services, Autodesk Fusion 360 ((IF you do not have any other Autodesk products installed, delete the Full Autodesk folder)
Delete the Fusion launch icon (from desktop or where you have it)
Restart the Mac
Download the installer again
Now install Fusion

Re: Fusion not starting up on Mac OS 15.3

murray_miskelly — Wed, 20 Aug 2025 22:24:05 GMT

Rajkumar,

The requested logs are attached as a zip file, hopefully they will come through.

I have created a new user and re-installed Fusion. It behaves correctly in that space so obviously it is something clashing with my user.

Good luck...

Murray

Re: Fusion not starting up on Mac OS 15.3

mt125136343F — Thu, 21 Aug 2025 15:36:29 GMT

Same issue

Re: Fusion not starting up on Mac OS 15.3

RajkumarIlanchelian — Thu, 21 Aug 2025 15:51:47 GMT

@mt125136343F Does any recommended solution called out in this thread help?

Re: Fusion not starting up on Mac OS 15.3

pirey4 — Thu, 21 Aug 2025 23:32:30 GMT

For the past month or so I have been having the same issue where I have to reinstall Fusion 360 every time I want to use it. Prior to that, everything worked fine and I could restart Fusion 360 without having to reinstall it. Now I'm having an additional problem. After trying the 8 steps that @shane_huston suggested above to clean up the install, I can't get past the login screen at the end of the install. It says "A browser window will open for you to sign in. If you can't find the browser window, retry browser sign-in.". A web browser page didn't open automatically so I manually opened Safari and logged back in but Fusion 360. When I restarted Fusion 360 after logging into the browser first, it opened Safari to the last tab I was on (where I logged into the Autodesk site) but Fusion 360 never starts. It keeps telling me to "Retry browser sign-in".

Re: Fusion not starting up on Mac OS 15.3

pirey4 — Fri, 22 Aug 2025 00:28:09 GMT

After rebooting a second time, (the first time was in Step 6 above) I was able to log in. I'll report back if I continue to run into the issue where I can't start Fusion 360 without re-installing it.

Re: Fusion not starting up on Mac OS 15.3

murray_miskelly — Wed, 27 Aug 2025 18:58:16 GMT

Good morning Rajkumar, I'm just wondering if there had been an update on looking at the app logs that I sent through?

Cheers,

Murray