There's something strange in those CTDs ... always happening on exit or pushing Escape button.
If I try to restart the game immediately, I get a message that the game is still running and trying to close Steam gives this kind of message:
"Please close the game before closing Steam"
Having a look in Task Manager ... it shows no AMS process running.
Stop Steam in Task Manager processes and restart only allow the game to restart. ( Or maybe I don't wait enough time before relauching AMS ? ).
Thanks daguru, that fix worked, can run the flat 6 on any track now. But... lol... when I leave the Track and go bck to Main Menu game crashes.tried several times with the same results every time. Oh well at least I can run my favorite mod, lol