Bank rec worked fine as of Feb 28 (Unreconciled Difference = $0.00). Changed period to Mar. Using same Feb 28 balance and not checking any transactions, it should remain okay. It's off by $12,233.24+ on a $100,000 balance, or more than 10%.
We had this problem last year. It just went away after several months with no explanation. Sage is no help without a service contract (first problem in 13 years, so no reason for a service contract). Initial calls with several Sage advisors last year sounded like they had never heard of this problem. No error messages anywhere.
For fun, continued to move out one period at a time. The difference Increased by the same amount in Apr ($24,466.48), 1.5 times in May ($42,816.34), the same amount in Jun ($55,049.58) and again in Jul ($67,282.82).
Running the utilities (Data Verification & Integrity Check) did not solve anything. No transaction (journal entry, deposit or check) for this amount.
Using Sage Peachtree Complete Accounting 2012 (SR-3).