Hi all,
After doing a bit more research based on Holger's comment, I can tell you this. 60% of the textures in the RWY12 Texture folder are also in the EZ Scenery Texture folder ...however there are just about zero duplication of scenery objects. In other words, the same textures are used by the two object libraries but to make different scenery objects.
Technically, FSX shouldn't get confused in this scenerio but, as Holger said, and as we have experienced, it does once in awhile. So far, the amount of times it gets confused seems very minimal and always with the same texture files. I have just found a two year old posting that identifed the same texture confusion with the files we have just identified above.
Interestingly enough, for those of you that combine all your object libraries into one folder set with one Scenery file and one Texture file, you would not have this particular problem since you overwrite one texture with another. That is probably why Brad & Spud don't have the problem. However, this is a pretty rare anomaly with FSX and now that we know the symptom we can easily fix it by adding the texture to the FSX\Texture folder.
Again, personally, I don't recommend combining all your object libraries, but wanted everyone to know a bit more about the issue. I may have to think about combining the RWY12 and EZ Scenery Libraries since there is 60% duplication of RWY12 Textures in the EZ Scenery Libraries.
Rod