I followed the steps outlined in a previous post for the same issue happening with QB2020 when .qba files would crash the 2020 program. The "fix" was to to update the QB 2021 program as it "interfered" with 2020 program. I have QB 2019 on my laptop but no later versions so I tried using the .qba files there and had no issues and could save transactions without crashing and getting the fatal error. On my desk machine, I did have QB 2020 loaded so I updated 2020 to the lasted version and now I can use the the 2019 .qba accountant copy files without issues! I am sure this is some unintended consequence of the latest program updates as I have never had this issue working with accountant copies in my 30+ years as a Pro-Advisor!
