I'm here to share some insight regarding the issue you encounter when using your QuickBooks Desktop (QBDT) account after the upgrade, JohnMartin78.

Before I start, I'd like to verify if you encounter some errors when using QBDT? If not, but the program is frozen, these could be the several possible causes:

• Your company name may be too long.
• You may have a damaged or missing QBWUSER.INI file.
• You may have corruption on your hard drive.
• QuickBooks Desktop installation or program file may be damaged.
• You may have a damaged Windows operating system.

To resolve the issue with QBDT, execute the Quick Fix my Program from the QuickBooks Tool Hub. But if you're done with this since you mentioned that you run the tool. I recommend following the Solution 2 found in this article: Fix issues when QuickBooks has stopped working.

You'll also want to read this article to learn how to optimize your server and workstations to minimize performance issues in QBDT: Resolve QuickBooks Desktop performance issues: Manage your computers.

Please reach out to me here if there's anything I can do to help you succeed. Thanks for dropping in, and wishing you a fantastic rest of your day.