We are a K12 district and, especially at the start of the school year, there are a lot of changes made in Synergy SIS, for example: teachers might get reassigned to teach a different class, or perhaps the course code needs correcting in Synergy.    (These things also happen at other times of the year, but the biggest bulk is at the start).  When this happens, teachers see their courses "disappear" and they panic!  Here is an explanation of why this happens, and one way on how to address it.