Update - This issue was fixed in the update released on 12/14/2018
As of the 11/30/2018 update, the Scheduling Master Schedule Board is not saving when editing or adding sections. After clicking the "Save" button, the "Updating..." message displays and does not complete. The "Copy" and "Drop Classes" buttons are working.
As a work-around, the Schedule Master Schedule page can be used instead of the Scheduling Master Schedule Board.
Programming is working on this now and will ship an update with the fix soon.