Other questions

2nd reply of the day.  As noted earlier I did a full uninstall, cleanup, reinstall.

At first things appeared to be okay.

I then applied all pending updates. 

Now, with generic setup and sample file only, crashes are back.

Per instruction in last comment by support, I opened the tool hub and did a quick fix my program.  After restarting, the same problem continues to occur.

Edit:  Back to tool hub, next option is Quickbooks program diagnostic tool, which is described as: will run through a variety of repair processes for all the Microsoft components ... I went ahead and ran that, rebooted, and as soon as I open the sample file, return to the utilities page to look at repair options it crashes again.

Based on where I can always trigger, I would suspect that your IE replacement code/browser is not playing nice with new versions of Windows 11, because it is always in the website browser page where you can download the tool hub, but before I actually have any interactions with the site.  And since that IE replacement browser code is probably always present in QB in some form, it might explain the intermittent nature of when this occurs.  If that change was implemented in the May timeframe as IE was approaching end of support then that would explain why the generic 2021 install without updates didn't seem to be problematic.  Is there a way to switch back to IE mode via a software switch/ini file/configuration setting to see if the issue stabilizes?  Just wearing my IT hat here, as my day job is software support.  I could be out in left field.  But I suspect if I load QB 2021 on a generic windows 10 or maybe even an off the shelf Win 11 pc, then I'd probably be okay but the dev builds of Windows 11 do sometimes have cutting edge restrictions that haven't been put into the real world yet.  That means whatever the OP and I are experiencing (and apparently another group of users per the comments), may become a very, very widespread issue if Microsoft does a patch cycle that pushes a change on their side triggering this.  It would be useful for all of us to narrow down the focus to what is actually happening and not keep trying to put bandaid fixes on it.

Regards.