This morning I ran SA-M and SA-N with the same creteria.  The report was ran for the month of February.  SA-M did not show any of the customers credtis for the month.
 

Lynn,
 
That's the problem, though.  The credits that don't show up on SA-M are not vouchers, but negative invoices.  Last month everything was fine and SA-M/SA-N matched for the same report.
 
This month (after the update), SA-M does not show credits.