Look for a similar thread in this same forum. An user was sure he had the latest version of KIAH, but he forgot to have created a dontupdate file, which will prevent our updater to ever update the scenery.
And, be sure you don't have any conflicting AFCAD for KIAH.
If you have:
- the GSX and SODE menus visible
AND
- KIAH listed as installed and active in the Addon Manger
AND
- The current version of KIAH
If all of these are true, then everything related to our software is properly installed and running, and if you don't see the scenery, it's nothing related to it, so it must be something external.