just load my old v26 save and encountered multiple problems: employees can't figure out their way ( excluding Airportstaff - they work as always), janitor can't find the way to the bath or to different other positions, or can't fin a security check. All checkpoints anabled for passenger and employee. Everything worked befor v27. Checked Zones, Walls etc. in my opinion it should work. Then I wondered why a huge amount of people checked-in on the yellow check-in's (see pictures) which belong to the small stands (in a own security zone) instead of the purple ones. The strange thing is the people from the small stand (yellow) checked-in on the purple ones. They also go inside the wrong security zone. Result of the whole thing is that no aircraft can depart/ or depart without passengers and baggage. All this strange behavior startet with v27 befor everything worked good. Already send a report today "Contractor BUG". In this save (muc_new) the contractors work normally. Only on new airports not. Hope i could explain it
so you can understand the problem. Save, Log and pictures attached here. If you have questions regarding the problem just ask!