I don't know if I'm on to something as there is a long learning curve to using this addon. I like it very much and would recommend it highly.
There were some threads on why objects are not showing up. I discovered that if an object was added, then deleted, another object for some reason could not be added to the same spot.
After adding and restarting FS9 several times only to find the object still not there, I found that if I load EZ and select the same object in the area where it was deleted from, the red box would appear which indicated the deleted object I thought was already gone. I simply through frustration deleted the object again without adding it to the file. I restarted the sim, returned to the same area found by the same method that the deleted object red box was now gone. A new object was selected and the new addon worked. TO make a long story short, sometimes you have to delete the object twice before anything new appears.