The Vans experimental airplanes were all working fine. Then suddenly, when any of them are loaded, the aircraft loads with engine running on tarmac and then the engine dies two seconds later. Fuel, pump, Mix=rich are good, although the mag switch no longer has the Off-Mag1-Mag2-On positions working, just Off-On. Only the Vans RV's seem to be affected. I even loaded a new version of the RV-10 from XPlane.org and it behaved the same way as the others (which came preloaded on XPlane) are now behaving. How do I resolve ? Also, I'm seeing there is no config setting for start with engine running.