well, it just happened again, same distance. 4 different directions and this hasn't happened at any other airport. no AI planes around. it's clearly an issue with the scenery because it doesn't happen when it is not installed.
If with "same distance", you still mean 37 NM out, it's clearly not the scenery, since it's not loaded from that far away and, if you didn't had AI ( are you sure ? AI are loaded in a bubble of 200 miles around you so, even if you don't see them, they are there ), it's possibly a problem with the Navdata in that area.
Of course, it FSDT KORD was really crashing, we would have heard it by now, considering it came out more than 2 years ago.