Kristeen,

I strongly recommend that you run 3-1-3-26 (or -56) (for contract receivables) and 11-1-3-26 (or -56) (for service receivables) to compare to your General Ledger Control Accounts.  Other aging reports tend to be less reliable. Have you run a 1-6 GL Audit and gotten no errors? If you have audit errors that won't go away with a 1-6 Recalculate Balances, then seek help from a consultant or tech support. If your audit is clean, you may have a problem with posting periods of invoices vs posting periods of cash receipts that may need help of a consultant or tech support to identify and correct.