Overtime Not Showing on Paycheck

I ran a two week payroll today and Sage 50 did not calculate overtime for an hourly employee on their paycheck.  Recorded hours were: Week 1, 40.5 hours; Week 2, 38 hours.  The employee was due .5 hour at time and a half, but the paycheck totaled them as straight time.  Is there a setting in Sage 50 that we don't have set properly?  Maddening to have to verify hours before printing checks for hourly employees...