As of January 1, 2024 QuickBooks Desktop for Mac 2019 will not open my company file.  I have been using QBDT successfully until December 30, 2023 on an Intel-based MacBook Pro running macOS Ventura.  Since this problem began, I have removed and reinstalled macOS Ventura; I have removed and reinstalled QBDT For Mac 2019, and still cannot open my company file.  I have tried QBDT For Mac 2021, 2023 and 2024 full version trial on my MacBook and my Mac Studio (apple silicon based).  QBDT 2019 will not even open (crashes instantly) on the Studio running macOS Sonoma. QBDT 2024 full-version trial does run on the Mac Studio, but still cannot open my company file from either the *.2019 active file or from a backup. All versions of QBDT will run on my MacBook, but NO version of the app will open any copy of my company file.  The various QBDT versions will allow me to open a sample company file, and start to create a new company file; close it and re-open it.  This has me stumped!  Does anyone have any idea as to how I can get over this brick wall?