I tried to reconcile the latest credit card statement and there was a discrepancy. All previous statements reconciled properly so I called Quicken Support for assistance. The support agent initially blamed using iCloud for my data file and then blamed the location on my internal hard drive when I explained that I don't use iCloud for storage.
The agent had me look at the reconciliation history which showed an error in the first statement reconciled 2 ½ years ago. After completing the phone call I saved a separate copy of the Quicken data file in the recommended location and opened my backup from the date of the error. That account reconciled properly and when I compared all of the Quicken transactions in the backup to the current transactions they were identical. I entered an adjustment in the history reconciliation which showed the error and then the latest statement reconciled successfully.
This happened again when I reconciled a second credit card and again the history showed an error in the first reconciliation which had reconciled correctly for 2 ½ years.
The agent would not accept my claim that Quicken must have caused these errors but blamed me or the file location instead.