Umberto, thanks for your quick reply, but after reading your post again I realized that I may need to explain my problem better.
-In FSX, the only other scenery I have from FSDT is Honolulu, which has been working very well until I downloaded the Hawaiian Airports demo just yesterday. Now there are no buildings in Honolulu.
-I have LAX (the old version for FS9), but I no longer run FS9, so that scenery is not in this setup.
-The Hawaiian Airports I downloaded yesterday, so it is the latest version, right?
So, in summary, my only FSDT scenery, Honolulu, is not working since I downloaded the Demo for Hilo yesterday. I await your reply with further instructions, thanks!!!
Included is a pic of Hilo with my photoreal background and not buildings with FSDT Hilo.