[GNC] Lost my top level aka Master account

[Mom]

Dear All:

I have been keeping my checkbook register on a Mac Powerbook computer via GnuCash since at least 2014. I recently migrated to a new-to-me Mac and when I open my GnuCash files, I no longer seem to have the top level account (master) file to my checkbook register! All of the income/expense detail accounts are there but without the master checking account file, I don’t have a running balance and I don’t see my transactions in calendar order.

Does anyone know how I can recover my master account? Any insight as to what has happened to my backup files?

Your help is much appreciated. I am hoping not to need to recreate my register for at least this calendar year.

Anne Giordani