Wallboard - after spend a few hours on chat and sharing screen with one agent, stepping through many of the same things I had tried already but not including the full uninstalled/cleanup/reinstall, we finally did a repair install which required a reboot.  Upon completion of that, of course it crashed again (more quickly than ever).  I then reconnected with chat to a new agent and they tried to upsell me on QB2022 because 2021 is not guaranteed to be compatible with Windows 11.  I was done at that point - I just paid to upgrade to 2021 and not ready to pay to upgrade again nor to go to subscription service.  I'd just like them to support their product.

Like you I think it was working till the recent updates to the embedded browser (like everyone in the world, they used Internet Explorer for a long time but Microsoft has pulled the plug on support).  In the c:\users\xxx\appdata\intuit folder structure is a qb dot net log that points to the embedded browser as the culprit behind these issues.

During some (very limited) experimentation, I think if I turn off the network on my pc, I can avoid the crashes.  So one possibility for my workflow, assuming they don't actually try to fix the error because "it's not supported on Win 11", is to connect, sync bank accounts, and then go offline for the rest of my reporting.  This will turn out to be a real pain but might be doable if under a crunch for time.  Or like you, I can fall back to a PC running Windows 10 and probably be fine.

Looking into the errors in these logs it doesn't look like a large issue - and if Intuit would take logs and provide to their engineers, a fix could probably be churned out in a few minutes.  But getting it escalated to them may not happen until a lot of customers start hitting the issues and push back against the "lets sell you more services and software" solution.