Whenever I have System Time chosen in Options, and try to create a flight or go from one airport to another, FS9 loads to about 50% and then just disappears off the screen. No error messages or anything else. What could be causing this? When I have Flight Time chosen, things seem to work normally.

I narrowed this down, and it turned out to UTUSA enhanced railroads causing the CTD's.

Yet another 3rd party add-on causing problems!