Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.

I did replace the terrain.cfg from a backup after changing the permissions\Users in Win7 and all is well so far . Once the Full ORBX Migration Tool comes out , it may be bye , bye to FSX .
Rich
Ditto at the "run as Administrator" . I'd also never install FSX / P3D inside the UAC controlled default folder structure (e.g. under programs or programs(x86) ).
I have the applications sitting on an own hard disk.
@Lionheart:
if you add the following lines under the [scenery] entry in the p3d.cfg, you'll see if anything's missing (texture or GUID references) in a scenery or on an aircraft:
// Alert for missing textures
ShowMissingTextureAlert=1// Alert for missing objects
MissingLibraryAlert=1// Render Trigger areas as visible boxes
ShowTriggers=1
0 triggers off, 1 triggers on. That's a most useful function for quality control and error checking, IMO.
Cheers,
Mark