Having a similar problem. Somethings quite not right. Some times when I load the 707 I have no landing gear and other times I may load the very same aircraft and same flight and the gear is there :-? and this isn't specific to one particular model it seems either. On top of that when this occurs I cannot click on/use any of the switches in the cockpit. I can hear them move etc but no animation or effect will follow.I tried loading the default Cessna and start off cold and dark and again the problem will occur to be honest I'm stumped.