Disabling on board sound has allowed me to fly the funtana 40 for example which caused me to crash instantly before. The FPS has not changed on the other aircraft.

Now there is another problem though. When I attempt to fly a heli, I press Fly, the sim pauses for a moment as if beginning to load, then the aircraft continues spinning around in 3D view etc. as if I had not done anything. When I attempted to fly a training session, it began loading but then returned to the pre-flight menu before loading. It did not crash my computer or the program, but these flights just would not load. Interestingly I could load the training sessions before disabling on board sound, but they would just crash as soon as I began.