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The first thing to do is ignore the beginning balance; use the statement and ending balance and try to reconcile. You might see some older transactions are no longer marked as Cleared = these are why the beginning balance is changed. Just keep working, and mark them, as well. This is called Mini-Rec or Re-Reconcile.
For instance, if you use the Accountants' copy and Import a Changes file, a reconciliation might be rolled back. Or, someone changed one check to a Bill Payment Check.
Beginning Balance = the Net of all previously Cleared transactions. If that Status got changed, the Beginning Balance Changed. That doesn't mean there is an Error. This is a Condition for the Status of Cleared or not.