After adding a new QF job to our QF scheduler - we are stuck. Getting the attached error.

Unable to sort because the IComparer.Compare() method returns inconsistent results. Either a value does not compare equal to itself, or one value repeatedly compared to another value yields different results. IComparer: 

Wehn loaded the QF Admin/Scheduler - clicking on schedules gives the above error.  We can see none of the pre-existing schedules, we had a dozen or so scheduled QF jobs.

Any ideas?  Restore from backup?