Thank you for the links. I solved the problem by clearing the filter and scanning everything in the reconcile window. There were transactions selected from a more recent month that has not been reconciled yet. Once I deselected them, my difference was zero.

I click the button at the top of the entries to "select all" but I am not able to click it again to deselect them. This has caused me some grief, though now I know what to look out for. I tried it in different browsers but still have the same result. Is this a glitch that Intuit is working on? I need to be able to deselect the ones that QBO automatically marks when I start the next reconciliation. It is very time consuming to click each individual transaction.