After copying a scheduling year, selecting to copy teachers and rooms only, the Teacher(s) column on the class record defaults back to last year's teacher when trying to update to a new teacher.
We are currently evaluating this issue and will update this article when we have more information. Alternative Solution: 1. Create a meeting for the class with no teacher selected. 2. Delete the meeting created in step 1. 3. Select the new teacher on the Classes tab. 4. Schedule the meetings as needed.