The problem you encountered is different from me. I never crash at the click of Start to Fly. My problem was the sim would crash every time after I got into the cockpit for 5~30 mins, sometimes on ground, sometimes in flight. The error code in the event viewer was 0xc0000005, faulty model sometimes shows VCRUNTIME140.dll, but most of the time FlightSimulator.exe.
Yesterday I found that I too have the problem that Sim would CTD when select another player or a friend from the world map. But this is not a big deal, I’m satisfied as long as I can fly normally without CTDs.
Have you tried this post? MSFS Application Error - memory could not be read
And this one? CTD in World Map!? - #22 by PhoenixHahn