For some reason, QB Desktop 2021 does not open the memorized reports from earlier versions of QB. When you generate the report, nothing happens.

QB recommends rebuilding data and verifying the file, but neither of those work. QB says you have to DELETE AND RECREATE YOUR MEMORIZED REPORTS! If you are an accountant like me, that could mean hundreds of reports. I don't know about you, but I do not have that kind of time.