Today we updated KIAH to support native P3D ground polygons, which should fix all issues related to ground flickering when used with non standard cameras, or some 3rd party addon sceneries.
To apply the Update:
- Be sure the sim is not running
- Start the FSDT Live Update from the Desktop icon.
If you use the full installer (no need to download it, since it hasn't been updated), the Live Update process which will be started at the end, will update the scenery in the same way.