Bank reconciliation following upgrade

Hi Evie5214, 

Thanks for posting and welcome to the Community Forum. 

I'm sorry to hear about your difficulties reconciling your accounts. Generally, if a bank reconciliation is previously balanced but won't balance after undoing reconciliation, there are likely hidden transactions on it. I recommend following these steps and trying reconciliations again. 

1. Open the reconcile accounts screen.
2. Choose the account in question.
3. Input the statement date 30/12/9998.
4. Mark all transactions check.
5. Copy the calculated closing balance to the closing statement balance.
6. Click reconcile.
7. Undo reconciliations.

These steps will make missing transactions appear. 

Let us know if you require any further assistance. 

Thanks,
Genreve