Hi there, @ksholgate.

Allow me to step in and help share some information about the deleted transactions.

We don't have an ongoing case regarding this unusual behavior after doing the update. I'd still suggest following my colleague's @KhimG advice to check your Audit Trail report first to verify. Then you can re-enter the transactions manually and perform a special reconciliation.

Also, I'd recommend reaching to our Desktop Specialist if there are no changes made on your Audit Trail report. They have extra tools to isolate this unusual behavior happening with your transactions after the update. 

This should guide you in the right direction. Should you need other references for future use, please feel free to visit our help site: Help articles for QuickBooks Desktop.

Let me know if you need anything else. I'll be here to help if you have other questions about the special reconciliation process.