I appreciate you for doing the necessary troubleshooting steps to determine the cause issue, Optimize. Let's get this fixed and make sure you're able to access your bank registers again.
Based on the troubleshooting steps you've mentioned, it's possible that we have a data-integrity issue on your company file. We can fix the damaged data by doing the Verify and Rebuild process. Fee free to browse this article for the detailed steps: Verify and Rebuild Data in QuickBooks Desktop.
After the troubleshooting steps, make sure to close and reopen QuickBooks. This will refresh your data and the program. Then, update QuickBooks to the latest release.
Let me know how this goes. I'll be right here if you need more assistance with this.
