Roles and permissions

Or you can also change the definition of the teacher role, changing it from the default of "Allow" for Manage metacourse to "Not Set".

Ray, it is both the issues: The teachers are NOT automatically unassigned as they should be and if you want to unassign them, you must do it manually, which defeats the purpose of syncing them in the first place.

Very strange issue indeed, hopefully it is fixed in later versions...