I have left Mathematica open for 2 days as it was running a very long test. Maybe something became corrupted. The first method did not work. It appears SetDirectory simply stopped functioning. Personally, I think the second method is better since it is atomic in nature. It doesn't depend on any stateful settings.
Has anyone else had this issue?
Paul McHale | Electrical Engineer, Energetic Systems | Excelitas Technologies Corp.