I am having the same problem. After starting the simulation in the cold and dark saved panel state, the main engine generators never come on. The engines are running, but the pneumatic engine bleed valves never open either. Additionally, the engines will not respond to any throttle movements. They remain in idle. The thrust anticipation arcs move along with the throttles, but engine RPM never moves. It seems as though this problem only occurs when starting the simulation from a cold and dark panel state.