Well, first and foremost, we would like to point out that O'Hare is surely guaranteed to work with FS9. Do the parking spaces appears in FS9 (I guess so) ? If they don't appear just in FSNav, than it should be more a question regarding FSNav.
I can only guess that FSNav reads an AFCAD file. Since, starting with 1.1, we are supplying two AFCADs, one for just the approaches, and another for everything else (so people can tweak or replace that one without having to worry about losing the approaches), perhaps FSNav got confused and instead of loading the normal AFCAD with parking stands, ILS, and all the rest, loaded the other one, that only contains approaches.
You can verify if this is the case, by renaming the KORD_APPR.BGL file to anything else than .BGL, and see if it works.