When preparing the final CD which includes paying off a loan at our institutions, what happens if the borrower makes a payment on
the loan to be paid off just prior to the closing and it makes the prepared CD inaccurate? The payment made might not be determined until after the closing. Should we be sending a corrected CD along with the refund check? Or is the original CD acceptable with the refund check?
Thank you.

Since is impacts the cash to close table and the payoff amount, a revised CD should be provided with the refund check.

Absolutely. The change in payoff affects an amount paid by the consumer. Corrected CD with Issue date equal to the date you send it, along with the refund check (unless the check has been sent earlier).

I reported this to be moved [wrong forum]. Is that another feature of BOL that no longer works? [just curious]