The old default AFCAD should be excluded. However, if you have another 3rd party AFCAD, it might interfere with the scenery. They usually come with AI traffic packages, like My Traffic. Try to search their folder if you find a .BGL that has a name related to KORD, and remove it.
Also, keep the KORD scenery on Top of the scenery library, which is where the installers puts it by default.