iMac running Catalina 10.15.7, 8g Ram, 4g Vram, 4GHz quad core Intel i7, CH pro pedals, Saitek X52 Joystick & throttle, Running under Steam.
Initially had problem assigning axes & buttons & could not achieve stable flight so unplugged controllers & set up using default settings. On re-start, once I had selected aircraft & location a large red "stop" button displayed & the sim locked up. One time it re-started the sim & repeatedly locked up. A couple of times the computer crashed & re-booted.
Any suggestions will be gratefully received. Note, I have been running FS2 for 3 years without any problems.