ACP showed an error dialog and then closed the program (if I dont remeber wrong). If the dome is closed only after the scope is parked and the park position is on the West side of the meridian, would the dome have been closed even if the scope would not have slewed to the West? And was the ACP still running (weather loop) while the error dialog was on the screen? I dont know as I was still awake and restarted ACP and homed the scope and resumed the observing before the weather become unsafe.