query: one week before closing freddie mac listing agent finds a problem with title do they still have to honor contract

The specifics of your case should be reviewed by your attorney, but in general unless the Freddie Mac sales contract gutted provisions that the property would be sold with good and marketable title, I would think Freddie Mac would have a chance to correct the problem. If they can't within the allotted time, the parties may or may not agree to an extension.