Im on a mission, freelance, and I've arrived at my destination. Parked and shut down, but the prop wont stop spinning, and the objective still says to wait for engine shutdown. Ive done a couple of manual shut downs and also a couple of shft ctrl E, but to no avail. Any ideas?

Ok what eventually helped was to unplug my airbus sidestick (the only peripheral connected at the time), and then finally the plane shut down properly. 

Anyone else keep having this issue? It happened again now, now connected with Saitek X52 throttle and joystick. 

Many planes are broken in different areas. Try a different plane?