From Monday to Thursday, a group of teachers staged a sit-in at the SF Unified School District building to protest the fact the district mishandled their paychecks. Some even went months without receiving the money that they're owed for their work. The district says it is working to resolve this, and blamed the problems mainly on its new payroll system. But teachers and union members say the issues run much deeper. Guest: Julia McEvoy, KQED senior editor  This episode was produced by Alan Montecillo and Maria Esquinca, and hosted by Devin Katayama. Episode transcript